Question

Solve the equations. 12x - 5y = -20y= x + 4 x=y=

Answer 1

We can substitute the second equation in the first one

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

Since x=0, then

`\begin{gathered} y=0+4 \\ y=4 \end{gathered}`

to be sure, we replace the result in the first equation

`12(0)-5(4)=0-20=-20`

Then the answer is x=0, y=4