# SOLUTION: 2x-y=-3 x+y=9

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 Question 395473: 2x-y=-3 x+y=9Answer by jim_thompson5910(28715)   (Show Source): You can put this solution on YOUR website!Start with the given system of equations: Add the equations together. You can do this by simply adding the two left sides and the two right sides separately like this: Group like terms. Combine like terms. Simplify. Divide both sides by to isolate . Reduce. ------------------------------------------------------------------ Now go back to the first equation. Plug in . Multiply. Subtract from both sides. Combine like terms on the right side. Divide both sides by to isolate . Reduce. So the solutions are and . Which form the ordered pair . This means that the system is consistent and independent. Notice when we graph the equations, we see that they intersect at . So this visually verifies our answer. Graph of (red) and (green) If you need more help, email me at jim_thompson5910@hotmail.com Also, feel free to check out my tutoring website Jim