Substitute -4x for y in equation y = -2x + 18 to obtain the value of x.
[tex]\begin{gathered} -4x=-2x+18 \\ -4x+2x=18 \\ x=\frac{18}{-2} \\ =-9 \end{gathered}[/tex]Substitute -9 for x in the equation y = -4x to obtain the value of y.
[tex]\begin{gathered} y=-4\cdot(-9) \\ =36 \end{gathered}[/tex]Thus solution of system of equation is (-9,36).
