Video solutions to help Grade 8 students learn how to solve equations that are not obviously linear equations.

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Lessons for Grade 8

Common Core For Grade 8

•Students rewrite and solve equations that are not obviously linear equations using properties of equality.

•Proportions are linear equations in disguise and are solved the same way we normally solve proportions.

•When multiplying a fraction with more than one term in the numerator and/or denominator by a number, put the
expressions with more than one term in parentheses so you remember to use the distributive property when
transforming the equation.

**NYS Math Module 4 Grade 8 Lesson 8 Classwork and Examples
**

**Concept Development**

Some linear equations may not look like linear equations upon first glance. A simple example that you should
recognize is

x/5 = 6/12

What do we call this kind of problem and how do we solve it?

**Theorem.** Given rational numbers A, B, C, and D, so that B ≠ 0 and D ≠ 0, the property states

If A/B = C/D, then AD = BC.

Example 1 - Example 4: Given a linear equation in disguise, we will try to solve it.

Example 5:
In the diagram below, △ABC ∼ △A'B'C'. Using what we know about similar triangles, we can determine the value of x.

Solve the following equations of rational expressions, if possible.

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