Question

Plzz solve with explanation.

Answer 1

Here is your answer

SUM of all the angle of the triangle is 180

As it is an issoceles triangle so third angle is 3y
$3y + 2y + 3y = 180 \\ 8y = 180 \\ y = 180 \div 8 \\ y = 22.5 \\ so \: angles \: 22.5 \times 3 = 67.5 \\ 67.5 \: \: and \: 45 \\ \\ now \\ x = 45 + 67.5 \\ x = 112.5 \\ x + y = 112.5 + 22.5 \\ x + y = 135 \: \: answer$
Hope it helps you

Answer 2

Hence x=112.5° and y=22.5° and sum of this is 112.5 + 22.5= 135°