Question

Solve the system by substitution. y= -2x + 18 y= -4x

Answer 1

Substitute -4x for y in equation y = -2x + 18 to obtain the value of x.

`\begin{gathered} -4x=-2x+18 \\ -4x+2x=18 \\ x=(18)/(-2) \\ =-9 \end{gathered}`

Substitute -9 for x in the equation y = -4x to obtain the value of y.

`\begin{gathered} y=-4\cdot(-9) \\ =36 \end{gathered}`

Thus solution of system of equation is (-9,36).