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y - 2x = 0 so y = 2x; x - 2(2x) = 6 ie -3x = 6 so x = -2, making y = -4
Check:
1. does -4 - 2 (-2) = 0? yes ,-4 + 4 = 0
2. does -2 - 2 (-4) = 6? yes, -2 + 8 = 6
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