The first step to solve this problem is to formulate
equations. Since the triangle has two equal sides, you can conclude that the angles
adjacent to the sides are equal which means:
3x – 11 = 2x + 11
We can now solve for the value of x:
3x – 2x = 11 + 11
x = 22
The sum of the angles of a triangle is 180 so we can
formulate another equation:
3x – 11 + 2x + 11 + 2y = 180
5x + 2y = 180
Remember that the value of x is 22 so you should substitute
the value of x:
5(22) + 2y = 180
110 + 2y = 180
2y = 180 – 110
2y =70
y = 35
