Let
and 

We have

Therefore

We have the equation of a line:

Put the coordinates of the point (0, 7) to the equation of a line:

Answer: 
Part 1 :
if the number of hours (h) is greater than 7.
Equation for the amount(A) in dollar is
Amount (A) = 210 + (h-7)x20
Part 2 :
if she earns 410,
with the same equation
410 = 210 + (h-7)x 20
200 =(h-7)x 20
10 = h-7
17 = h
therefore, number of hours tutored is 17.
Answer:
c. 3
Step-by-step explanation:
You just multiply the pre image points by 3 and you get the image.
6x-9=15
6x=24
x=4
Therefore the answer is A.
Hope this helps :)