Big Ideas Math: Modeling Real Life, Grade 7
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3. Solving Two-Step Equations
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Exercise 26 Page 143

Start by adding 13 to both sides.

g=- 5

Practice makes perfect
To solve an equation, we should first gather all of the variable terms on one side and all of the constant terms on the other side using the Properties of Equality. In this case, the only variable term is already on the left-hand side of the equation, so we will start by adding 13 to both sides.
3/5g-1/3=- 10/3
3/5g-1/3+1/3=- 10/3+1/3
â–Ľ
Add terms
3/5g+(- 1/3)+1/3=- 10/3+1/3
3/5g+- 1/3+1/3= - 10/3+1/3
3/5g+- 1+1/3= - 10+1/3
3/5g+0/3= - 9/3

0/a=0

3/5g+0= - 9/3
3/5g= - 9/3
3/5g=- 9/3
3/5g=- 3
Now, we are going to multiply the equation by 5, and then divide it by 3 using the Multiplication and Division Properties of Equality. This will help us get rid of the fraction. Let's go!
3/5g=- 3
3g/5=- 3
3g/5 * 5= - 3 * 5
3g=- 3 * 5
3g = - 15
3g/3 = - 15/3
â–Ľ
Calculate quotient
3g/3 =- 15/3
g = - 5
The solution to the equation is g = - 5. We can check our solution by substituting it into the original equation.
3/5g-1/3=- 10/3
3/5( - 5)-1/3 ? = - 10/3
â–Ľ
Simplify
- 3/5* 5 -1/3 ? =- 10/3
- 3 -1/3 ? =- 10/3
- 9/3 -1/3 ? =- 10/3
- 9/3 -1/3 ? =- 10/3
- 9-1/3 ? =- 10/3
-10/3 ? =- 10/3
- 10/3=- 10/3
Since the left-hand side is equal to the right-hand side, our solution is correct.