Question

Solve linear equations using substitution y=-4x
y=4x+16

Answer 1

(-2 , 8)

Explanation:

`\begin{cases}y=-4x&\\ y=4x+16&\end{cases}`

We substitute y by -4x in the second equation of the system:

-4x = 4x + 16

⇔ -8x = 16

⇔ x = 16/(-8)

⇔ x = -2

Now ,we substitute x by -2 in the first equation of the system:

y = -4 × (-2) = 8

then

the solution of the system is {(x = -2 , y = 8)}