SOLUTION: solve by graphing, and then check your ordered pair in both equations by 'plugging it in' to confirm that it is a solution to the system: x+y= -1 2x-y=4

Algebra ->  Linear-equations -> SOLUTION: solve by graphing, and then check your ordered pair in both equations by 'plugging it in' to confirm that it is a solution to the system: x+y= -1 2x-y=4      Log On


   

Question 333867: solve by graphing, and then check your ordered pair in both equations by 'plugging it in' to confirm that it is a solution to the system:
x+y= -1
2x-y=4
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
x+y= -1
y=-x-1 red line
2x-y=4
-y=-2x+4
y=2x-4 green line
Create a graph by saying
+graph%28+300%2C+200%2C+-6%2C+5%2C+-10%2C+10%2C+-x+-1%2C+2x+-4%29+ (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -x -1 and 2x -4).
Solution (1,-2).
Proofs:
-2=-1-1
-2=-2
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-2=2*1-4
-2=2-4
-2=-2