The correct statement using the concept of slope is:
Exercity charges $3 more per month than Fit for Life
How to Interpret the Slope of the Linear Equation?
The general form for the equation of a line in slope intercept form is:
y = mx + c
where:
m is slope
c is y-intercept
The equation for total cost for membership at Fit for Life is :
C = 75 + 32x
Thus, the cost per month is $32
For membership cost at Exercity:
Slope = (120 - 85)/(2 - 1)
Slope = $35
Thus, the cost per month is $35