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4x - 3y = 15..............x2
21x + 6y = 57
8x - 6y = 30
----------------------- +
29x = 87
x = 3
4(3) - 3y = 15
12 - 3y = 15
-3y = 3
y = -1
3x - 2y =
3 (3) - 2 (-1) = 9 + 2 = 11
Jawabannya 11
4x - 3y = 15 x2
21x + 6y = 57
8x - 6y = 30 +
29x =87
x = 3
y -> 7(3) + 2y = 19
21 + 2y = 19
2y = -2
y = -1
3x-2y = 3(3) - 2(-1)
= 9+2 = 11