mohon dijawab y kakak

3x-10 + 5x+10 = 180
8x = 180
x = 22,5

2y-30 = 3x-10
= 3(22,5)-10
= 57,5
2y = 87,5
y = 43,75

x+y = 22,5 + 43,75
= 66,25