Algebramedium · Past Paper
If 2x + y = 7 and x + 2y = 8, find the value of x - y.
A-1
B1
C0
D15
✓ Correct Answer: A — -1
Subtract the second equation from the first: (2x - x) + (y - 2y) = 7 - 8 -> x - y = -1.
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