Question

Help, please? :) Which equation is not equivalent to the formula d = rt?

A r=t/d
B r=d/t
C t=d/r
D tr

Answer 1

I believe that the last one is d=tr .. ?

Suppose you have a=bc, then

a=bc
=> a=cb
=> c=a/b
=> b=a/c

And, many more such equations!

Answer 2

for d=rt the following equations work:
r=d/t
t=d/r
d=tr
So that means A. r=t/d is not equivalent.
Why? Because to find r you must divide t from both sides making d/t not t/d.
Hope this helps! (: