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March 29, 2015

March 29, 2015

Posted by **TAMMY** on Friday, April 27, 2007 at 10:00am.

x + y = 4

–x + y = 2

confused where do i start do i need to solve for x and find points

I'll bet that after doing a few like this you would be able to do this one in your head.

just add then up. The x's will cancel and you will have 2y = 6

so dividing by 2 gives y = 3

so mentally replace the y with 3 in the first equation and you are left with

x + 3 = 4

using just good ol' common sense will give you x = 1

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