Question

How do you solve `(2a+4)/3=6/9`?

Answer 1

`a=-1`

Explanation:

Solve by cross multiplication (`a/b = c/d` = `ad = bc`).

`(2a+4)/3 = 6/9`

`(2a+4)(9) = (3)(6)`

`18a + 36 = 18`

`18a = -18`

`a = -1`

Plug in `-1` for `a` to check.

`(2(-1)+4)/3 = 6/9`

`2/3 = 6/9`

`2/3 = (6divide3)/(9divide3)`

`2/3 = 2/3`