tolong dijawab kak besok dikumpulin

4. 3x+2x=90
5x=90
x=18

PQS = 3x = 54

5. 3x-42 = 2x+7
x=49

y+42 + 2x+7 = 180
y+2x+49=180
y+98+49=180
y+147=180
y=33

x+y = 82