22-02-2016
Mathematics

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03-03-2016

Here are the two equations:
2x - y = 2
x + 2y = 18.5

By substitution.
2x - y = 2
y = 2x - 2

Substitute y to the second equation: x + 2y = 18.5
x + 2(2x-2) = 18.5
x + 4x - 4 = 18.5
5x = 22.5
x = 4.5

get y by substituting x to 2x - y = 2
2(4.5) - y = 2
y = 7

So x = 4.5, y = 7

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