So two co-ordinates are (2,-5) and (0,-3)
First obtain the gradient (slope) by (y2-y1)/(x2-x1) so (-3–-5)/(0–2) so 2/-2 = -1
So the first part of the equation is y=-x.
Then to find out how many you need to + or - just calculate it:
In (2,-5), -x is -2. To get to -5 you need to subtract another 3, hence y=-x-3. It shouls be the same in the other co-ordinate (0,-3) if I’ve done it right: -x = 0. Subtract 3 for -3.
So y = -x - 3 should do it.
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