7х+у=-9 и 3х+4у=14 решите пж

Question

7х+у=-9 и 3х+4у=14 решите пж

Answer 1

Y=-9-7x
3x+4(-9-7x)=14
3x-36-28x=14
-25x=50
x=-2
y=-9-7*(-2)
y=-9+14
y=5

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