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2x+y=15 |x2| 4x+2y=30
coret 2y =5x+4x=6+30
=9x=36
x=4
x=4 -> 5x-2y=6
(4x5)-2y=6
20-2y=6
2y=6-20
2y=-14
y=-7
4a - 3b = - 4
jadi 4a - 3(6a - 1) = - 4
4a - 18a + 3 = - 4
- 14a + 3 = - 4
- 14a = -7
a = 1/2
b. 5x-2y=6 x2 10x - 4y = 12
2x+y=15 x5 10x + 5y = 75 dikurangi
-9y = - 63
y = 7
5x-2y=6 x1 5x - 2y = 6
2x+y=15 x2 4x + 2y = 30 ditambah
9x = 36
x = 4