SOLUTION: Plz help me with this.. Solve the following systems of equation using addition to eliminate one. If the system has no solution,indicate that it is inconsistent;if it has infininte

Question 949229: Plz help me with this..
Solve the following systems of equation using addition to eliminate one. If the system has no solution,indicate that it is inconsistent;if it has infininte solutions,indicate that it is Dependant;if the system has one solution,check your answer.
-y=2x
3x+y=20.. Thanks
Answer by MathLover1(20849) (Show Source): You can put this solution on YOUR website!
.....write in standard form

-----------------
...both sides multiply by
...both sides multiply by
-----------------

-----------------...add

now find

so, the system has one solution
these lines intersect at (,)

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