(-9x+4y = 55)*11 ------> - 99x+44y = 605
(-11x+7y = 82)*(-9) ------> 99 - 63y = -738
- 19y = - 133
y=7
-11x+7y = 82, -11x+7*7 = 82, -11x = 33, x= -3
Answer is (-3,7).
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