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Posted by **Kelly** on Saturday, February 25, 2012 at 8:20pm.

x+y=7

Please help me solve this system of equation and show your work.

- Math -
**Reiny**, Saturday, February 25, 2012 at 8:34pmI would multiply the 2nd equation by 4, then subtract ...

5x+4y=8

4x+4y=28

x = -20

sub into 2nd

-20 + y = 7

y = 27

x = -20 , y = 27

- Math -
**Piggy**, Saturday, February 25, 2012 at 8:40pm5x + 4y = 8

x + y = 7

Find x :

x = 7 - y

5(7 - y) + 4y = 8

35 - 5y + 4y = 8

-y = 8 - 35

y = 27

x = 7 + 27

x = 34

y = 27

x = 34

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