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=85x+60
C-60=85x
C-60/85=x
x=C-60/85
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 C-60/85 x
315 315-60/85 3
485 485-60/85 5

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