Question

Need help with solving 4x-y=9, x-3y=16?

Answer 1

`x` is equal to `1` and `y` is equal to `-5`.

Explanation:

`{(4x-y=9), (x-3y=16) :}`

Do

`4x-y=9`
`(x-3y)xx4=16xx4`

So

`{(4x-y=9), (4x-12y=64) :}`

Subtract the two equations

`0x+11y= -55`

`11y=-55`

`y=-5`

Replace `y` in the first equation

`4x-y=9`

`4x-(-5)=9`

`4x+5=9`

`4x=4`

`x=1`