SOLUTION: i dont understand how what to do with this slope equation -3,(5,8)

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Question 225050: i dont understand how what to do with this slope equation -3,(5,8)
Answer by LtAurora(115) About Me  (Show Source):
You can put this solution on YOUR website!
Okay, slope is m=-3.
Plug into this equation:
%28y-y_1%29=m%28x-x_1%29
%28y-8%29=-3%28x-5%29
Simplify:
y-8=-3x%2B15
Add 8 to both sides:
y=-3x%2B23, which is our answer.