Kenneth S. answered • 04/17/18
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
the most fundamental way to solve a system of two linear equations is substitution.
There are other methods, such as the 'multiply-and-add' method of elimination, the Gauss-Jordan method, use of determinants (Cramer's rule) and matrix methods.
I suggest that you review your textbook (or equivalent).
Hint: multiply first equation throughout by 3 and multiply second equation by four; add the resulting two equations. This will eliminate the variable y and you'll solve for x, and then...
Good luck.
