Question

what is the value of x????​

Answer 1

angle DBA and angle ABC are supplementary angles

DBA + ABC = 180°

7y + 5y = 180°

12y = 180°

y = 180/12

y = 15°

now

ABD is exterior angle of ∆ABC

x + 3y = 7y

x = 7y - 3y

x = 4y

= 4*15°

x = 60°