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Math Topics

Elementary Algebra

Systems of Linear Equations

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1
Solving Linear Systems by Graphing

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2
The Elimination Method

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3
The Substitution Method

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4
Applications

**Mini Lecture**

Two positive numbers have a difference of \(5\). The larger is one more than twice the smaller. Find the two numbers.

A woman invests \(4\) times as much money at \(5\%\) than she does at \(6\%\). The total interest for the year is \(\$520\). How much is invested at each rate?

Tom has \(21\) coins totaling \(\$3.45\). The coins are dimes and quarters. How many of each type does he have?

How many liters of \(50\%\) alcohol solution and \(20\%\) alcohol solution must be mixed to obtain \(18\) liters of \(30\%\) solution?