3) ΔWXY is an isosceles triangle with WX = WY. If WX is 3 more than four times x, xy is 7 less than five times x, and Wy is 66 less than seven times x, find x and the measure of each side.
4) Graph ΔDEF, then classify the triangle.
(a) D(8,-6) E(-1,-3) F(-2,5)