Question

in the given parallelogram ABCD, find the value of x and y. angleA= 3y , angleB= (2y-5) , angleC= (3x+3)​

Answer 1

Angle A=3y, B=2y-5, C=3x+3,

Angle D=180-3y (because A&D are supplementary)

Angle D+Angle B= 180°

180-3y+2y-5=180

-y-5=0

y= -5

Angle A+AngleC= 180°

3y+3x+3=180

x+y=59

substitute y in this equation: x-5=59

x=64

Therfore, x=64 & y= (-5)