Tlong jwab bserta cara yak :) mohon bantuannya, mayan lho pointny :)

jawb

<B₁ + <B₄ = 180 (pelurus0
6x  + 78 = 180
6x =  180 -78 = 102
x= 102 / 6 = 17

<A₄ = <B₄ = sehadap
3y  = 6x
y = 2x 
y  = 2(17)= 34

x + y = 17 + 34 = 51