Question

Please help im very confused how to do this.​

Answer 1

Explanation:

(a)

`(b + x)/(3) = (b - x)/(4) \\ 4b + 4x = 3b - 3x \\ b = - 7x`

(b)

`p = (y)/(1 + y \\ ) \\ p + py = y \\ y - py = p \\ y = (p)/(1 - p)`

(c)

`(1)/(a) = (1)/(b) - (1)/(c) \\ (1)/(c ) = (1)/(b) - (1)/(a) \\ (1)/(c) = (a - b)/(ab) \\ c = (ab)/(a - b)`