SOLUTION: elimination method 3x-9y=10 15x-45y=20 I multiplied the first equation by 5 which gives 15x+45y=50 15x-45y=20 ___________ 30x = 70 is that right?

Algebra ->  Equations -> SOLUTION: elimination method 3x-9y=10 15x-45y=20 I multiplied the first equation by 5 which gives 15x+45y=50 15x-45y=20 ___________ 30x = 70 is that right?      Log On


   

Question 45841: elimination method
3x-9y=10
15x-45y=20
I multiplied the first equation by 5 which gives 15x+45y=50
15x-45y=20
___________
30x = 70
is that right?
Answer by tutorcecilia(2152) About Me  (Show Source):
You can put this solution on YOUR website!
Multiply by (-5) instead of (5):
-5(3x-9y=10
15x-45y=20
________________
.
.
-15x+45y=-50
+15x-45y=20
________________
0 = -30 (false statement)
.
[Graphing shows that the lines are parallel, not perpendicular]