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Question:
To solve the system by eliminating y, multiply the first equation, 2x–y=–5, by 4 to obtain 8x–4y=–20. Next, add the second equation, x+4y=11, to the transformed equation and then solve the resulting equation for x.
8x−4y=−20
x+4y=11
9x+0=−9
9x=−9
9x9=−99
x=−1
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