SOLUTION: solve by substitution x-y=-3 x-y=4

Question 119769: solve by substitution
x-y=-3
x-y=4
Answer by checkley71(8403) (Show Source): You can put this solution on YOUR website!
x-y=-3 & x-y=4 do not have unique solutions:
x=y-3
(y-3)-y=4
y-3-y=4
-3=4 not a solution.
even if you attempt to graph these 2 equations there is no solution:
(graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions y = x +3 and y = x -4).
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