Posted by **please i need help!!! i dont get it** on Monday, January 17, 2011 at 6:52pm.

how do u answer this? please step by step

*graph and check to solve the linear system

y=-x+3

y=x+1

Thank you very very much!!! :)

- math(algebra 1) -
**helper**, Monday, January 17, 2011 at 7:20pm
y = -x + 3

y = x + 1

rewrite

y + x = 3

y - x = 1

to eliminate the variable x, add the 2 equations together. Since x + -x = 0, the x variable is eliminated

ADD

y + x = 3

y - x = 1

2y = 4

y = 2

to find x, substitute y = 2 in

y + x = 3

2 + x = 3

x = 1

CHECK

x = 1, y = 2

y - x = 1

2 - 1 = 1

1 = 1

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