What is the slope for this:

9x+8

The triangles are similar. what is the value of x? enter your answer in the box. x = two right triangles. the larger right triangle is labeled x on the longer leg, 12 on the shorter leg and 20 on the hypotenuse. the smaller triangle is labeled 4 on the longer leg, 3 on the shorter leg, and 5 on the hypotenuse.

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

What is the equation of this graphed line? enter your answer in slope-intercept form in the box.