Jackson pays $18 per month for his phone service, plus $0.07 for each long distance minute used. Which of the following correctly describes the y-intercept?

Answer:
The answer is b.
Step-by-step explanation:
You could represent the phone service price with an equation that is
y = 0.07x + 18
So the intercept in y is 18 when x is zero, that is the minimum price of the phone service.