First calculate x. since its an isosceles triangle, and the 2 isosceles sides r same so the base angles are the same therefore 7x + 5 = 9x - 13 5 + 13 = 9x - 7x 2x = 18 x = 9 so when we have x = 9, just use the angle sum of triangle to calculate y. 4y + 7x9 + 5 + 9x9 -13 = 180 4y + 136 = 180 y= 11 so there u have it, x is 9 ans y is 11
