Given function: f(x) = x^2 - 3x - 9
Substitute the value of x into the function
Example: x = 4
f(4) = 4^2 - 3(4) - 9
Simplify
f(4) = 16 - 12 - 9
f(4) = -5
Answer: For x = 4, f(x) = -5

Given equation: y = -9x
Identify the slope-intercept form
Slope-intercept form: y = mx + b
Where m = slope, b = y-intercept
Compare y = -9x with y = mx + b
m = -9
Answer: The slope is -9