The cell phone store is having a new years sale! You can save 20%on the iphone. If the phone usually costs $300 how, much will i
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Looks like the system is
We can eliminate by taking
so that , and
Substitute into this last equation and solve for
:
Then
Plug these values into any one of the original equation to solve for :
Hence the solution is x = 4, y = -3, and z = 2.