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Y = -1
2x + y = 5
2.3 + -1 =5
3x - 2y = 11
3.3 - 2(-1) = 11
9 - (-2) = 11
3x-2y=11 ×1
4x+2y=10
3x-2y=11
__________ +
x = -1
2x+y=5
2(-1)+y=5
-2+y=5
y=5+2
y=7
x=-1
y=7