Penyelesaian dari pldv3a+b=-9 dan5a-10=80

5a - 10 = 80
5a = 80 + 10
5a = 90
a = 18

3a + b = -9
3 . 18 + b = -9
54 + b = - 9
b = -9 - 54
b = - 63


mohon di koreksi terlebih dahulu