Question

How do you solve `3x-y= 4` and `2x-3y= -9`?

Answer 1

See below.

Explanation:

Multiplying the first equation by `3`,

`9x-3y=12`

`2x-3y=-9`

Subtracting the two equations,

`7x=21`

So `x=3`

Plugging this in,

`2(3)-3y=-9`

`6+9=3y`

`y=5`

So, our final solution is `(3,5)`.