SOLUTION: question is Find y if a line through the points (5,-8) and (3,y) has slope of -5

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Question 18697: question is Find y if a line through the points (5,-8) and (3,y) has slope of -5
Answer by Earlsdon(6098) About Me  (Show Source):
You can put this solution on YOUR website!
You can start with the formula for the slope of a line when you are given two points on the line. m+=+%28y2-y1%29%2F%28x2-x1%29.
The given points are: (5, -8) this is (x1, y1) and (3, y) this is (x2, y2)
m+=+%28y+-+%28-8%29%29%2F%283+-+5%29 But m = -5
-5+=+%28y+%2B+8%29%2F-2%29 Multiply both sides by -2
10+=+y+%2B+8 Subtract 8 from both sides.
y+=+2
Check:
m+=+%282+-+%28-8%29%29%2F%283+-+5%29
m+=+%282+%2B+8%29%2F-2
m+=+10%2F-2
m+=+-5