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Big Ideas Math Integrated I, 2016

BI

Big Ideas Math Integrated I, 2016 View details

5. Rewriting Equations and Formulas

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Exercise 23 Page 40

Practice makes perfect

a To solve the equation for

x,

means we should isolate

x .

C = 85 x + 60

$LHS - 60 = RHS - 60$

C - 60 = 85 x

$LHS / 85 = RHS / 85$

\frac{C - 6 0}{8 5} = x

Rearrange equation

x = \frac{C - 6 0}{8 5}

b To determine the number of ski trips we can take for

315

dollars and

485

dollars, we can substitute those values for

C

into the equation from Part A and solve for

x .

$C$	$\frac{C - 6 0}{8 5}$	$x$
$315$	$\frac{3 1 5 - 6 0}{8 5}$	$3$
$485$	$\frac{4 8 5 - 6 0}{8 5}$	$5$

If we spend $315$ dollars, we can have $3$ ski trips. If we spend $485$ dollars, we can have $5$ ski trips.

Subchapter links

Communicate Your Answer p.35

Monitoring Progress p.36-39

Exercises p.40-42