7X+8Y=4 14X+18Y=8 问X和Y等于几?

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7X+8Y=414X+18Y=8问X和Y等于几?7X+8Y=414X+18Y=8问X和Y等于几?7X+8Y=414X+18Y=8问X和Y等于几?7X+8Y=4.[1]14X+18Y=8.[2][1]*

7X+8Y=4 14X+18Y=8 问X和Y等于几?
7X+8Y=4 14X+18Y=8 问X和Y等于几?

7X+8Y=4 14X+18Y=8 问X和Y等于几?
7X+8Y=4 .[1]
14X+18Y=8.[2]
[1]*2:14x+16y=8.[3]
[2]-[3]:
2y=0
y=0
x=4/7