Consider the system of equations 4x + y = –2 and 4x + 5y = –6. Would you use the substitution method or the elimination method to solve this system algebraically? Why? Thanks in advance.
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3It depends on your level of easiness with these methods. In this case as the coefficients of $x$ in both the equations are same, it will be easier to use elimination. – QED Dec 10 '17 at 04:14
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multiplying the first equation by $-1$ we get $$-4x-y=-2$$ $$4x+5y=-6$$ adding both equations we obtain $$4y=-4$$ and from here you will get $y$ and then $x$
Dr. Sonnhard Graubner
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