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.