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xy+x−4y=11,xy−x−4y=4
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Solution
(
x=72,
y=−15
)
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Solution steps
Solve by:
One step at a time
[
xy+x−4y=11
xy−x−4y=4
]
Subtract the equations
xy+x−4y=11
−
xy−x−4y=4
xy+x−4y−(xy−x−4y)=11−4
Simplify
2x=7
Solve 2x=7:x=72
Plug the solutions x=72 into xy+x−4y=11
For xy+x−4y=11, subsitute x with 72:y=−15
Verify solutions by plugging them into the original equations
Therefore, the final solution for xy+x−4y=11,xy−x−4y=4 is