Question

How do you solve the system `8x + 6y = -9` and `y = -8` using substitution?

Answer 1

Answer is `x=39/8` and `y=-8`

Explanation:

Here you just substitute `y=-8` in the first equation `8x+6y=-9`

This gives `8x+6*(-8)=-9`

or `8x-48=-9`

or `8x=48-9=39`

Hence, `x=39/8`

Answer is `x=39/8` and `y=-8`.