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posted by on .

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 - ,

    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 - ,

    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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