SOLUTION: How do I solve this system by any method? I know you plug in the x equation into the second equation and get 18 = 18 but how do i find the solution? x = 2y-9 -2x+4y = 18

Algebra ->  Trigonometry-basics -> SOLUTION: How do I solve this system by any method? I know you plug in the x equation into the second equation and get 18 = 18 but how do i find the solution? x = 2y-9 -2x+4y = 18      Log On


   

Question 929904: How do I solve this system by any method?
I know you plug in the x equation into the second equation and get 18 = 18 but how do i find the solution?
x = 2y-9
-2x+4y = 18
Answer by ewatrrr(24785) About Me  (Show Source):
You can put this solution on YOUR website!
x = 2y-9
-2x+4y = 18
........
-2(2y-9) + 4y = 18
-4y + 18 + 4y = 18
18 = 18
Infinite solutions. They are Same Line.
.....Note
x = 2y-9
0r
x - 2y = -9
0r
-2(x - 2y = -9) = -2x + 4y = 18 ( same as the second EQ)