Verified Answer :

\(y=36-9x\)
\(3*x+\frac{y}{3}=12\)
substitution of y in 2nd by right side of 1st equation:
\(3*x+\frac{36-9x}{3}=12\)
\(3*x+12-3*x=12\)
\(12=12\)
This is identical equation which means there is infinite number of solutions, make sure the symbols in equations are right.

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