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Elementary Algebra
Linear Equations and Inequalities in Two Variables

1
Paired Data and Graphing Ordered Pairs

Problem 1

Construct scatter diagrams for odd numbers and the sequence of squares using the tables shown.

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Stefanie cc
Stefanie
Preston cc
Preston
Cynthia cc spanish language icon
Cynthia
Problem 2

Graph the ordered pairs \((3,4)\), \((3,-4)\), \((-3,4)\), and \((-3,-4)\). Also, identify which quadrant each point lies in.

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Mrs. Mooney cc
Mrs. Mooney
Breylor cc
Breylor
Claire cc
Claire
Octabio spanish language icon
Octabio
Problem 3

Graph the ordered pairs \((-1,3)\), \((2,5)\), \((0,0)\), \((0,-3)\), and \((4,0)\). State which quadrant each point lies in.

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Mrs. Mooney cc
Mrs. Mooney
Breylor cc
Breylor
Claire cc
Claire
Octabio spanish language icon
Octabio
Problem 4

Mini Lecture
Graph each ordered pair.

  1. \((3,2)\)

  2. \((-3,2)\)

  3. \((3,-2)\)

  4. \((-3,-2)\)

  5. \((-1,5)\)

  6. \((0,0)\)

  7. \((3,0)\)

  8. \((0,5)\)

Choose instructor to watch:
Mr. McKeague cc
Mr. McKeague

2
Graphing Linear Equations in Two Variables

Problem 1

Which ordered pairs, \((2, 3), (1, 5), (-2, -4)\), are solutions to \(y=3x+2\)?

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Molly S. cc
Molly S.
Betsy cc
Betsy
Cynthia spanish language icon
Cynthia
Problem 2

Given \(2x+3y=6\), complete the ordered pairs \((0, \quad), (\quad ,1), (3, \quad )\).

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Molly S. cc
Molly S.
Preston cc
Preston
Betsy cc
Betsy
David spanish language icon
David
Problem 3

Given \(y=2x-1\), complete the ordered pairs \((0, \quad), (5, \quad), (\quad, 7), (\quad, 3)\).

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Molly S. cc
Molly S.
Preston cc
Preston
Betsy cc
Betsy
David spanish language icon
David
Problem 4

Graph \(x+y=5\)

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Stephanie cc
Stephanie
Preston cc
Preston
Betsy cc
Betsy
David spanish language icon
David
Problem 5

Graph \(y=3x-1\)

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Lauren cc
Lauren
Preston cc
Preston
Betsy cc
Betsy
Cynthia spanish language icon
Cynthia
Problem 6

Graph \(3x-2y=6\)

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Betsy cc
Betsy
Lauren cc
Lauren
Preston cc
Preston
David spanish language icon
David
Problem 7

Graph each of the following lines.

  1. \(y=\displaystyle\frac{1}{2}x\)

  2. \(x=3\)

  3. \(y=-2\)

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Betsy cc
Betsy
Preston cc
Preston
Julieta cc spanish language icon
Julieta
Problem 8

Mini Lecture
Graph each equation.

  1. \(x+y=3\)

  2. \(y=-\displaystyle\frac{2}{3}x+1\)

  3. \(-2x+y=1\)

  4. \(x+-2\)

  5. \(y=2\)

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Mr. McKeague cc
Mr. McKeague
Problem 9

Mini Lecture
Fill in the ordered pairs.

  1. \(2x+y=6 \quad (0,\quad), (\quad,3), (\quad,-6)\)

  2. \(x=-5 \quad (\quad,-3), (\quad,-6)\)

  3. \(y=3x \quad (1,\quad), (-3,\quad), (\quad, 0)\)

  4. Which are solutions to \(y=6x\)? \((1,6), (-2,12), (0,0)\)

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Mr. McKeague cc
Mr. McKeague

3
More on Graphing: Intercepts

Problem 1

Find the \(x\)- and \(y\)-intercepts for \(3x-2y=6\), and graph.

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Betsy cc
Betsy
Preston cc
Preston
David cc spanish language icon
David
Problem 2

Graph \(-x+2y=4\) by finding the intercepts.

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Stephanie cc
Stephanie
Betsy cc
Betsy
Preston cc
Preston
David spanish language icon
David
Problem 3

Use the intercepts of \(y=-\displaystyle\frac{1}{3}x+2\) to draw its graph.

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Jesse cc
Jesse
Betsy cc
Betsy
Preston cc
Preston
David spanish language icon
David
Problem 4

What is the \(y\)-intercept of \(y=\dfrac{1}{2}x-5\)?

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Mrs. Mooney cc
Mrs. Mooney
Breylor cc
Breylor
Claire cc
Claire
Octabio spanish language icon
Octabio
Problem 5

What is the \(y\)-intercept of \(y=2x+\dfrac{1}{3}\)?

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Mrs. Mooney cc
Mrs. Mooney
Breylor cc
Breylor
Claire cc
Claire
Octabio spanish language icon
Octabio
Problem 6

What is the \(y\)-intercept of \(y=6\)?

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Mrs. Mooney cc
Mrs. Mooney
Breylor cc
Breylor
Nathan cc
Nathan
Octabio spanish language icon
Octabio
Problem 7

What is the \(y\)-intercept of \(y=4-x\)?

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Mrs. Mooney cc
Mrs. Mooney
Breylor cc
Breylor
Nathan cc
Nathan
Octabio spanish language icon
Octabio
Problem 8

Mini lecture
Graph.

  1. \(5x+2y=10\)

  2. \(y=\displaystyle\frac{1}{2}x+3\)

  3. \(y=-2x\)

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Mr. McKeague cc
Mr. McKeague

4
The Slope of a Line

Problem 1

Find the slope through \((1, 2)\) and \((3, 5)\)

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Betsy cc
Betsy
Preston cc
Preston
Katherine cc
Katherine
David spanish language icon
David
Problem 2

Find the slope through \((-2,1)\) and \((5, -4)\)

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Betsy cc
Betsy
Preston cc
Preston
Molly S. cc
Molly S.
Cynthia spanish language icon
Cynthia
Problem 3

Find the slope of the line shown in Figure 6.

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Stephanie cc
Stephanie
Breylor cc
Breylor
Nathan cc
Nathan
Octabio spanish language icon
Octabio
Problem 4

Graph the line with slope \(-\dfrac{3}{2}\) and passing through the point \((1,1)\).

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Stephanie cc
Stephanie
Breylor cc
Breylor
Nathan cc
Nathan
Octabio spanish language icon
Octabio
Problem 5

Find the slope of the line containing \((3,-1)\) and \((3,4)\).

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Betsy cc
Betsy
CJ cc
CJ
Preston cc
Preston
Cynthia spanish language icon
Cynthia
Problem 6

The graph in Figure 4 shows the rise in U.S. Retail Ecommerce sales over a five-year period, which is approximately linear. Use the graph to find the slope of the line, and then interpret the slope as a rate of change.

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Stephanie cc
Stephanie
Nathan cc
Nathan
Breylor cc
Breylor
Octabio spanish language icon
Octabio
Problem 7

Determine if the lines passing through the given pairs of points are parallel, perpendicular, or neither:
\((-1, -5)\) and \((2, 1)\),
\((-2, 2)\) and \((6, -2)\),

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Stephanie
Stephanie
Nathan
Nathan
Breylor
Breylor
Octabio spanish language icon
Octabio
Problem 8

Mini Lecture

  1. Find the slope between \((-3,-2)\) and \((1,3)\).

  2. Graph the line with the slope \(\displaystyle\frac{3}{2}\) and \(y\)-intercept \(-3\).

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Mr. McKeague cc
Mr. McKeague

5
Slope-Intercept Form

Problem 1

Find the slope and \(y\)-intercept of the line \(y=\dfrac{3}{2}x+1\).

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Stephanie cc
Stephanie
Nathan cc
Nathan
Breylor cc
Breylor
Octabio spanish language icon
Octabio
Problem 2

Find the slope and \(y\)-intercept for \(-2x+y=-4\). Then draw the graph.

Choose instructor to watch:
Betsy cc
Betsy
Preston cc
Preston
CJ cc
CJ
Cynthia spanish language icon
Cynthia
Problem 3

Find the slope and \(y\)-intercept for \(3x-2y=6\).

Choose instructor to watch:
Betsy cc
Betsy
Preston cc
Preston
CJ cc
CJ
Cynthia spanish language icon
Cynthia
Problem 4

Find the equation, and graph the line with slope \(-\dfrac{4}{3}\) and \(y\)-intercept \(5\).

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Betsy cc
Betsy
Preston cc
Preston
Molly S. cc
Molly S.
Cynthia spanish language icon
Cynthia
Problem 5

Find the equation of the line with slope \(-2\) that contains the point \((-4,3)\).

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Mr. McKeague cc
Mr. McKeague
Preston cc
Preston
Betsy cc
Betsy
Cynthia spanish language icon
Cynthia
Problem 6

Find the equation of the line passing through the point \((2,5)\) and perpendicular to the line \(3x+4y=12\). Write the answer in slope-intercept form.

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Stephanie cc
Stephanie
Nathan cc
Nathan
Breylor cc
Breylor
Octabio spanish language icon
Octabio
Problem 7

Find the equation of the horizontal line passing through the point \((-3,-1)\).

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Stephanie cc
Stephanie
Nathan cc
Nathan
Breylor cc
Breylor
Octabio spanish language icon
Octabio
Problem 8

Mini Lecture

  1. Find the equation of the line with \(m=\displaystyle\frac{3}{2}\) and \(b=-1\).

  2. Find the slope and \(y\)-intercept of \(4x-5y=20\).

  3. Find the equation of the line through \((-2,-5)\) with slope \(m=2\).

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Mr. McKeague cc
Mr. McKeague

6
Point-Slope Form

Problem 1

Find the equation of the line with slope \(-2\) that contains the point \((-4,3)\).

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Mr. McKeague cc
Mr. McKeague
Preston cc
Preston
Betsy cc
Betsy
Cynthia spanish language icon
Cynthia
Problem 2

Find the equation of the line that passes through \((-3,3)\) and \((3, -1)\).

Choose instructor to watch:
Betsy cc
Betsy
Preston cc
Preston
CJ cc
CJ
Cynthia spanish language icon
Cynthia
Problem 3

Find the equation of the line passing through \((4,-5)\) with

  1. zero slope

  2. no slope

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Stephanie cc
Stephanie
Nathan cc
Nathan
Breylor cc
Breylor
Octabio spanish language icon
Octabio
Problem 4

Find the equation of the line passing through the point \((-3,-2)\) and parallel to the line \(3x-5y=10\). Write the answer in standard form.

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Stephanie cc
Stephanie
Nathan cc
Nathan
Breylor cc
Breylor
Octabio spanish language icon
Octabio

7
Linear Inequalities in Two Variables

Problem 1

Graph \(x+y\leq 4\)

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Betsy cc
Betsy
Preston cc
Preston
Molly S. cc
Molly S.
Cynthia spanish language icon
Cynthia
Problem 2

Graph \(y<2x-3\)

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Betsy cc
Betsy
Preston cc
Preston
Molly S. cc
Molly S.
Cynthia spanish language icon
Cynthia
Problem 3

Graph the inequality \(2x+3y\leq 0\)

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Stephanie cc
Stephanie
Nathan cc
Nathan
Breylor cc
Breylor
Octabio spanish language icon
Octabio
Problem 4

Graph \(x \leq 5\)

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Betsy cc
Betsy
Preston cc
Preston
Molly S. cc
Molly S.
Cynthia spanish language icon
Cynthia
Problem 5

Mini Lecture
Graph.

  1. \(2x-3y<6\)

  2. \(y\geq x-5\)

  3. \(y<2\)

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Mr. McKeague cc
Mr. McKeague