(x,-5) & (2,7)
want distans=13
distans=root(deltax^2 +deltay^2)
deltax=2-x......deltax^2=x^2-4x+4
deltay=7-(-5)=12
deltay^2=144
distans^2=13^2=169
(x^2-4x+4) +144=169
so x^2 -4x =169-144-4=21
or x^2 -4x -21=0
x=7 or -3....take 7
points: (7,-5) & (2,7)
7-12-13 rite triangel