Question

How do you solve the following system: `x-3y=20 , 7x+15y=32`?

Answer 1

`x=11`
`y=-3`

Explanation:

= `x-3y=20`

= `x=20+3y` **

Put above in other equation

= `7(20+3y)+15y=32`

= `140+21y+15y=32`

= `21y+15y=32-140`

= `36y=-108`

=`y=-3`

Now for `x`

=`x-3(-3)=20`

=`x+9=20`

=`x=11`

Hope this helps!