Answer:
y = -3x + 7
Explanation:
We are given that the slope of the line is -3; this means that m = -3.
So, y = -3x + b.
Now we need to find the y-intercept, or b. To do this, we substitute the given point (5, -8) into this function y = -3x + b.
It will look like this:
-8 = -3(5) + b
Simplify and solve for b.
-8 = -15 + b
7 = b
Now that we know what the y-intercept, or b, is, we can put this value back into our equation to get y = -3x + 7.