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Alpha Teach Yourself Algebra I in 24 Hours by Jane Cook

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Hour 15
Equations with Two Variables: Graphing
The real-life applications of ratios, proportions, and percents in the previous two hours of study brought together your knowledge of polynomials, algebraic fractions, and simplifying expressions. The variety of real-world problems you can now solve is a perfect example of why it’s important to understand and use algebra with confidence.
 
Think back for a moment to solving equations. Your goal in solving all the equations so far has been to isolate the variable. Each equation had a single variable, although sometimes it appeared on both sides of the equals sign. This hour marks a turning point in your study of algebra. Most of the work from now on focuses on working with two different variables ...

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