Question

How do you solve the system `4x=-11+y` and `y=-6x-9`?

Answer 1

`4x-y=-11`..... Eq 1

`6x+y=-9`.......Eq 2

Adding both the equations:

`4x+6xcancel(-y)cancel(+y)=-11-9`

`10x=-20`

`x=-20/10`

`color(magenta)(x=-2`