Question

A Zoo Park charges $10 per car plus $1 per person as an admission fee. The total charge for a car with x people is f(x) = x+10. How will the graph of this function change if the per car charge is changed to $5 per car?
A)The line will shift vertically down by $5.
B)The line will shift vertically up by $5.
C)The line will shift vertically up by $15.
D)The line will shift vertically down by $15.

Answer 1

Your answer is A The line will shift vertically down by $5.

Answer 2

Hi!
The answer would be A because 10 is the y intercept and it's higher than 5 so if you were to put a smaller number than 10 as the y intercept, then it would go down. Also the y intercept is a vertical line so it would go down vertically. And it is down by 5 because 10 - 5 is 5. 
So the answer is A!
Hope this helps!