SOLUTION: Goodmorning, I need help with this Solve the system by graphing, addition and substitution methods. 3x + y = �1 9x + 3y = �3 Thank you

Question 88288: Goodmorning, I need help with this
Solve the system by graphing, addition and substitution methods.
3x + y = �1
9x + 3y = �3
Thank you
Answer by rapaljer(4671) (Show Source): You can put this solution on YOUR website!
3x + y = �1
9x + 3y = �3

Multiply both sides of the first equation by -3 to eliminate the y terms.
-3*(3x + y) = (-3)*�1
9x + 3y = �3

-9x -3 y = 3
9x + 3y = �3

When you add the equations together you get 0=0, which is ALWAYS TRUE. Any time you get 0=0, it means that the equations actually represent the SAME LINE. The entire line is the solution.

R^2

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