The scale factor is the bigger over the smaller, so
is the scale factor.
To find x, we just use a proportion Biggest to Smallest:

4x = 48
x = 12
So F(6) means 6 on the x axis then look to see where the graph is on the Y axis,
in this case on x 6 y=4
Add 8 to both sides
-4a /5= 10
Multiply both sides by 5
-4a= 50
A= - 12.5
repeating because its just 05050505 over and over again.