Question

Can some please do these for me

Answer 1

12.
`(r-3)/(-4-(-8)) = -5`

`(r-3)/(4) = -5`
r - 3 = 4(-5)
r - 3 = -20
r = -20 + 3
r = -17

13.
`(r-2)/(-2-5) = (5)/(6)`

`(r-2)/(-7) = (5)/(6)`
6(r - 2) = -7(5)
6r - 12 = -35
6r = -35 + 12
6r = - 23
r =
`(-23)/(6)`