Question 1013343
-5x + 8y = 7
3y = -2x - 9
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2x + 3y = -9 Eqn 1
5x - 8y = -7 Eqn 2
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10x + 15y = -45 Eqn 1 times 5
10x - 16y = -14 Eqn 2 times 2
-------------------------------------- Subtract
31y = -31
y = -1
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etc
What's the big deal?