1.y-y1=m(x-X1) 2. Find slope between (1,3) and (5,1) Y1-Y2 X1-X2 Y-3 =
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First, let's define our variables.
Let's call our width X(given)
and our length, since it's 10 shorter than 3 times the width, we can call our length:
3x-10
So, the perimeter of a rectange is equal to 2 times the length + 2 times the width.
So, when we plug our values in, we get
The perimeter is 8x-20