For this case, the first thing we must do is define variables.
We have then:
x: number of times Giselle uses the athletic club
b: amount of money remaining
We write a linear equation of the form:
b = mx + c
Where,
m: slope of the line that represents the cost for each time she uses the athletic club
c: initial amount that Giselle paid
Substituting values we have:
b = -10x + 190
Answer:
a linear function that model the situation is:
d. b = 190 - 10x
