Question

Which of the following number lines represents the solution to d/-2+5=7?

Answer 1

Option D

Explanation:

Solve for d

d has to be isolated and made the subject of the equation:

`(d)/(-2) + 5 = 7`

`(d)/(-2) = 7 - 5`

`(d)/(-2) = 2`

`(d)/(-2) = (2)/(1)`

Cross-multiplication is applied:

`(d)(1) = (-2)(2)`

∴ d =
`-4`

Since d is equal to
`-4`, then the coloured dot should be placed on
`-4` on the number line

∴Option D