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Big Ideas Math: Modeling Real Life, Grade 7
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Big Ideas Math: Modeling Real Life, Grade 7 View details
3. Solving Two-Step Equations
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Exercise 1 Page 143

Undo the multiplication using the Division Property of Equality.

z=6

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. Using the Division Property of Equality, we will divide both sides by 3 to isolate z.
3z=18
DivEqn

.LHS /3.=.RHS /3.

3z/3 = 18/3
CalcQuot

Calculate quotient

z=6
The solution to the equation is z=6. We can check our solution by substituting it into the original equation.
3z =18
Substitute

z= 6

3( 6) ? = 18
Multiply

Multiply

18=18
Since the left-hand side is equal to the right-hand side, our solution is correct.
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arrow_right Try It p.140-141
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Try It 2 (Page 140)
Try It 3 (Page 140)
Try It 4 (Page 140)
Try It 5 (Page 140)
Try It 6 (Page 140)
Try It 7 (Page 141)
Try It 8 (Page 141)
Try It 9 (Page 141)
arrow_right Self-Assessment for Concept & Skills p.141
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Self-Assessment for Concept & Skills 11 (Page 141)
Self-Assessment for Concept & Skills 12 (Page 141)
Self-Assessment for Concept & Skills 13 (Page 141)
Self-Assessment for Concept & Skills 14 (Page 141)
Self-Assessment for Concept & Skills 15 (Page 141)
Self-Assessment for Concept & Skills 16 (Page 141)
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arrow_right Self-Assessment for Problem Solving p.142
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arrow_right Review & Refresh p.143
Review & Refresh 1 (Page 143)
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arrow_right Concept, Skills, & Problem Solving p.143-144
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