Answer:
A. 15
Explanation:
The slope intercept form of a line is given by the equation
y = mx + c where m is the slope and c the y-intercept
Rewrite given equation
y - 9 = 15(x - 5) in slope-intercept for
1. Expand the right side by multiplying each term in parenthesis by 15
15(x - 5) = 15x - 75
This gives us
y - 9 = 15x - 75
Add 9 to both sides
y - 9 + 9 = 15x - 75 + 9
y = 15x -66
So slope is 15 and y-intercept is -66