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7x - y= -10, -7x + 5y= -6 (linear combination)
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7x - y= -10, -7x + 5y= -6 (linear combination)

User Eugen
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7x-y=-10
-7x+5y=-6

(7x)+(-7x)= 0
(-y)+(5y)= 4y
(-10)+(-6)=-16

so... ANSWER: 4y=16
User Daniel Cassidy
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