Question

What's the answer for proportions 7/9=b/b-10

Answer 1

-35

Explanation:

`(7)/(9)` =
`(b)/(b - 10)` multiply both sides by 9(b -10)

`(9(b - 10))/(1)`
`((7)/(9))` =
`(9(b -10))/(1)`
`((b)/(b-10))` On the right side of the equation, the 9's cancel out and on the right side of the equation the (b -10) cancels out to leave

7(b -10) = 9b Distribute the 7

7b - 70 = 9b Subtract 7b from both sides

-70 = 2b Divide both sides by 2

-35 = b