About Slope Intercept Form:
- y = mx + b
- m represents the slope
- b represents the y-intercept or AKA the starting point
ABOUT PROBLEM:
- Since -3/2 is the slope, it represents m in Slope Intercept Form
- Since -5 is the y-intercept, it represents b in Slope Intrecept Form
y = mx + b
y = -3/2x + -5 --- IN Slope Intercept Form
Hope this helps you!!! :)
Answer:

Step-by-step explanation:
Given
Let x represent the number of tickets, and p the charges

A reduction of 50c gives an increment of 50 tickets.
This gives:
---- 

Required
Determine the demand function
First, calculate the slope:




So, the equation is:




Hence, the function is:

It is m + 9 because if we let m = 60 and the lest was 9 minutes longer than m, the test would be 69 minutes long. Therefore the answer is m + 9