Since it is an isosceles triangle, the two angles across from the two equal sides must be equal. Therefore, 8y-7=73 so 8y=80 so y=10.
So, each of those to base angles is 73°. If you add them together those two angles equal 146°. Since there are 180° in a triangle, 180-146 equals 34 degrees.
So 6x+4=34 so 6x=30 so x=5.
