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Big Ideas Math: Modeling Real Life, Grade 8

BI

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

Cumulative Practice

Exercise 2 Page 135

Apply inverse operations to isolate t.

B

To solve the given formula for t, we will use the Properties of Equality to apply inverse operations on the formula. Remember, only like terms can be combined.

C=11+1.6t

LHS-11=RHS-11

C-11=1.6t

.LHS /1.6.=.RHS /1.6.

C-11/1.6 = t

Rearrange equation

t=C-11/1.6

Note that in this case, we were asked to solve for the used therms t, given the formula for the cost. A solution of t= C-111.6 means that we have solved for the number of therms used each month. Therefore, the correct option is B.

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