Question

Which of the following is equivalent to e+f/a-d = b/a

a(e+f) = b(a-d)
a+f/a-d = b/a
ae+f = ab-d
b(e+f) = a(a-d)

I don't know how to do this:/ Some guidance would be great:)

Answer 1

None of them are if you meant it the way you typed your first equation.

If you meant:
(e+f)/(a-d) = b/a, then a(e+f) = b(a-d) would be the equivalent

Answer 2

(e+f)/(a-d) = b/a

clear the denominators (also known as cross-multiplying)

(e+f)a = b(a-d)

or,
(e+f)/b = (a-d)/a

Looks like the first one is good.

Answer 3

Okay, I see. Thank you both!:)