Question

How do you solve `\frac { x } { 3} - \frac { y } { 7} = - 1`?

Answer 1

Multiply by 21

`7x-3y=-21`

Add 3y

`7x=3y-21`

Divide by 7

`x=3/7y-3`

OR

`7x=3y-21`

Add 21

`7x+21=3y`

Divide by 3

`7/3x+7=y`