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Mathematics
Gaven Boyd
1 April, 14:25
2x - 3y = - 4 if x + 3y = 7
+2
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1
)
Tomas Kline
1 April, 15:26
0
Leave x alone on one side.
x = 7 - 3y
Substitute into equation
2 (7 - 3y) - 3y = - 4
Distribute
14 - 6y - 3y = - 4
Solve
14 - 9y = - 4
14 + 4 = 9y
18 = 9y
y = 18/9
y = 2
x = 1
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