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First you need to eliminate one of the letters. In this case, by adding the two equations together we can eliminate y.

x - y = 90

+

x + y = 360

__________

2x = 450

x = 225

if x = 225 we can put this back in to the first equation to find y.

x - y = 90 ----- 225 - y = 90 ----- 225 - 90 = y ----- 135 = y

Now, knowing that x = 225 and y = 135 we can double check that this is right by trying these numbers in the second equation.

x + y = 360 ----- 225 + 135 = 360!! Correct!

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14y ago

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