The Purplemath Forums

Can anyone help with this problem? The problem is:
Solve the following system of equations graphically.
x + y - 4 = 0
x - y = 0
The solution lies in quadrant _____.
A.I
B.II
C.III
D.IV

I can't figure out how to solve that.

Thanks,
SplitWindowVette

nicknation wrote:

SplitWindowVette wrote:Solve the following system of equations graphically.
x + y - 4 = 0
x - y = 0

I can't figure out how to solve that.

solve them for y and then graph

http://www.purplemath.com/modules/graphlin.htm

the answer is where they cross

Thanks!

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I know how to solve systems of equations by graphing and substituting, but not with the comparision method, can someone help?