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Question
Find the point of intersection of x+y=−1x−y=15
Find the point of intersection of x+y=−1x−y=15
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Solution
The correct option is A (7, -8)
x+y=−1x=−1−yx−y=15−1−y−y=15−2y=15+1y=16−2y=−8x−8=−1x=−1+8x=7(x.y)=(7,−8)
x+y=−1x=−1−yx−y=15−1−y−y=15−2y=15+1y=16−2y=−8x−8=−1x=−1+8x=7(x.y)=(7,−8)
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