Question

hi can you help me with an algebra assignment pleasy=-7x,y=4x+22 solve the system by substitution.

Answer 1

Given:

$\begin{gathered} y=-7x \\ y=4x+22 \end{gathered}$

Put y=-7x in second equation,

$\begin{gathered} y=4x+22 \\ -7x=4x+22 \\ -7x-4x=22 \\ -11x=22 \\ x=-\frac{22}{11} \\ x=-2 \end{gathered}$

Put the value of x in first equation,

$y=-7x=-7(-2)=14$

Answer: x = -2, y = 14.