How do you solve the system of equations 4y = 2x - 9 and - 6x - 3y = 3?

1 Answer
AltairSafir
Mar 30, 2018

The system is:
4y=2x-9
-6x-3y=3

Explanation:

Expand the first equation by 3.
6x-27=12y
-6x-3y=3
sum the equations:
0 -27-3y=12y+3
rearrange it:
-3y-12y=3+27
-15y=30
y=-2
put it in one of the equation:
4*(-2)=2x-9
2x=-8+9=1
x=1/2

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