Posted by **Riley** on Wednesday, November 12, 2008 at 12:02pm.

I have to solve the system.

3x + y = 12

y = 9 - 3x

I used the substitution method to get

3x + 9 - 3x = 12

But now I'm stuck.

- Math -
**bobpursley**, Wednesday, November 12, 2008 at 12:49pm
The system is indeterminate. THe two lines are parallel, and do not have a solution. Rearrange the second equation to

3x+y=9 Which is the same x,y coefficents as the first equation.

- Math -
**Reiny**, Wednesday, November 12, 2008 at 12:50pm
Solving a system of equations means finding the intersection of the two lines.

Your 2 equations represent two parallel lines, they cannot intersect, therefore you cannot have a solution.

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