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2x - y = 2
_________ -
4y = 16
y = 4
2x - y = 2 ... 2x-4=2 .. 2x=6 .. x= 3
2x-3y = 2.3 - 3.4 = 6 - 12 = -6
2x - y = 2
------------------- -
4y = 16
y = 16/4 = 4
2x + (3.4) = 18
2x + 12 = 18
2x = 6
x = 3
2x - 3y = (2.3) - (3.4)
= 6 - 12
= -6