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Use the substitution method to solve the system of equationsy=4x8x+y=18

User Cristian Mora
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1 Answer

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16 votes

Given data:

The first equation is y=4x.

The second equation is 8x+y=18.

Substitute first equation into second equation.


\begin{gathered} 8x+4x=18 \\ 12x=18 \\ x=(3)/(2) \end{gathered}

Substitute 3/2 for x in the first equation.


\begin{gathered} y=4((3)/(2)) \\ =6 \end{gathered}

Thus, the value of x is 3/2, and the value of y is 6.

User Eric Nicolas
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