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2x + y = 8 -------------------------> 2x + y = 8
-------------------------- -
3y = 12
y = 12 : 3
y = 4
x + 2y = 10
x + 2.(4) = 10
x + 8 = 10
x = 10 - 8
x = 2 ...jawaban C
8) 2x + 3y = 17 ...... kalikan dengan 2 ----> 4x + 6y = 34
3x + 2y = 13 ...... kalikan dengan 3 -----> 9x + 6y = 39
----------------------- -
- 5x = - 5
x = - 5 : - 5
x = 1
3x + 2y = 13
3 .1 + 2y = 13
3 + 2y = 13
2y = 13 - 3
2y = 10
y = 10 : 2
y = 5 ... jawaban B
9) x + y = 40
x - y = 8 .....jawaban A