Question

Solve the system of the equations12x -5y = -20y = x + 4x =y =

Answer 1

$\begin{gathered} 12x-5y=-20 \\ y=x+4 \end{gathered}$

whe can replace the second equation on the first equation to find x

$\begin{gathered} 12x-5(x+4)=-20 \\ 12x-5x-20=-20 \\ 7x=-20+20 \\ x=\frac{0}{7} \\ \\ x=0 \end{gathered}$

the value of x is 0, now i can replace x=0 on any equation and find y

i will replace x=0 on the second equation

$\begin{gathered} y=(0)+4 \\ y=4 \end{gathered}$

the value of y is 4