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Solve the system by substitution -×+ 3y = 20 7y = ×

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Given, 7y=x.

Hence, substitute 7y for x in equation -x+3y=20.


\begin{gathered} -x+3y=20 \\ -7y+3y=20 \\ -4y=20 \\ y=-5 \end{gathered}

Now, substitute y=-5 in 7y=x.


\begin{gathered} 7*(-5)=x \\ -35=x \end{gathered}

Therefore, the values of x and y are -35 and -5 respectively.

User Anthony Harley
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