The equation of line joining two points
(a,b) and (c,d) is given by
You have three points and you are asked to find the equations of those three lines which join them
Now think ahead yourself and tell if you feel trouble
Make a sketch on the coordinate plane will make things easier .
Let me start you off with the line AB .
The gradient is -1 and we know the line passes through point (-5,3) or
thus , y=-x-2
do it this way for the remaining two sides of the triangle .