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12-04-2018
Mathematics

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12-04-2018

Subtract the equations

x + y = 3.5
-3x -y = -2.5
-----------------------
-2x + 0 = 1

Solve for x
-2x = 1
x = 1/(-2) = -1/2 = -0.5

Sub into 1st equation:
-0.5 + y = 3.5
y = 3.5 + 0.5 = 4

Solution = (-0.5,4)

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