no.33 tolong d jwb+cara

x/4 + y/3 = 1/12
3x/12 + 4y/12 = 1/12
3x + 4y = 1

x/2 - y/5 = 19/10
5x/10 - 2y/10 = 19/10
5x - 2y = 19

3x + 4y = 1 >> × 1
5x - 2y = 19 >> × 2
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3x + 4y = 1
10x - 4y = 38
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13x = 39
x = 3

3x + 4y = 1
(3 × 3) + 4y = 1
9 + 4y = 1
4y = 1 - 9
4y = -8
y = -2

jawaban : x = 3, y = -2 (D)