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Big Ideas Math: Modeling Real Life, Grade 8

BI

Big Ideas Math: Modeling Real Life, Grade 8 View details

3. Solving Equations with Variables on Both Sides

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Exercise 14 Page 22

Gather all of the variable terms on one side of the equation and all of the constant terms on the other side.

p=-2

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.

-24-8p=4p

LHS+8p=RHS+8p

-24-8p+8p=4p+8p

Add terms

-24=12p

.LHS /12.=.RHS /12.

-24/12=12p/12

MoveNegNumToFrac

Put minus sign in front of fraction

- 24/12=12p/12

Calculate quotient

-2 = p

Rearrange equation

p =-2

The solution to the equation is p=-2. We can check our solution by substituting it into the original equation.

-24-8p=4p

p= -2

-24-8( -2) ? = 4( -2)

▼

Simplify

a(- b)=- a * b

-24+16 ? = -8

Add terms

-8=-8

Since the left-hand side is equal to the right-hand side, our solution is correct.

Subchapter links

Try It p.18-20

Self-Assessment for Concepts & Skills p.20

Self-Assessment for Problem Solving p.21

Review & Refresh p.22

Concepts, Skills, & Problem Solving p.22-24