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1. nilai x yg memenuhi sistem persamaan 1 + 3x = -4y dan 9x= 2y+4 adalah..
1. nilai x yg memenuhi sistem persamaan 1 + 3x = -4y dan 9x= 2y+4 adalah..
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3x + 4y = -1
9x = 2y + 4
9x - 2y = 4
9x - 2y = 4
-2y = 4 - 9x
2y = -4 + 9x
4y = -8 + 18x
3x + 4y = -1
3x - 8 + 18x = -1
21x = -1 + 8
21x = 7
x = 7 / 21
x = 1/3
3x + 4y = -1
3(1/3) + 4y = -1
1 + 4y = -1
4y = -1 -1
4y = -2
y = -2/4
y = -1/2