Question 59605
x + y = 3
x + y = -1
Re-write each equation in the slope-intecept format (y=mx+b)
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x+y=3
y=-x+3 [graph]
.
x+y=-1
y=-x-1 [graph]
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The purpose of graphing two lines is to find the point of intersection.  These lines do not intersect, so they do not have any points in common.
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{{{ graph( 300, 200, -6, 5, -10, 10, -x+3, -x+1) }}}