\left\{ \begin{array} { l } { 4 x + x = 9 } \\ { 2 x = y } \end{array} \right.
Solve for x, y
x = \frac{9}{5} = 1\frac{4}{5} = 1.8
y = \frac{18}{5} = 3\frac{3}{5} = 3.6
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5x=9
Consider the first equation. Combine 4x and x to get 5x.
x=\frac{9}{5}
Divide both sides by 5.
2\times \frac{9}{5}=y
Consider the second equation. Insert the known values of variables into the equation.
\frac{18}{5}=y
Multiply 2 and \frac{9}{5} to get \frac{18}{5}.
y=\frac{18}{5}
Swap sides so that all variable terms are on the left hand side.
x=\frac{9}{5} y=\frac{18}{5}
The system is now solved.
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