SOLUTION: 18)Solve the system of equations by the addition method. x/4-y/12=-1 x/3+y/9=-2

Algebra ->  Expressions-with-variables -> SOLUTION: 18)Solve the system of equations by the addition method. x/4-y/12=-1 x/3+y/9=-2       Log On


   

Question 382115: 18)Solve the system of equations by the addition method.
x/4-y/12=-1
x/3+y/9=-2

Answer by mananth(16946) About Me  (Show Source):
You can put this solution on YOUR website!
x/4-y/12=-1
multiply by12
3x-y=-12.................1
x/3+y/9=-2
multiply by 9
3x+y = -18................2
...
add 1 & 2
6x=-12-18
6x=-30
/6
%28highlight%28x=-5%29%29
..
plug value of x in 1
3*-5-y=-12
-15-y=-12
-15+12=y
%28highlight%28y=-3%29%29
...
m.ananth@hotmail.ca