SOLUTION: Please help I do not understand this problem and here it is: build each Rational expression into an equivalent rational expression with the indicated denominator. -7yt/3x

Question 171949: Please help I do not understand this problem and here it is: build each Rational expression into an equivalent rational expression with the indicated denominator.
-7yt/3x= (?)/18xyt
Answer by Mathtut(3670) (Show Source): You can put this solution on YOUR website!
basically they want you to cross multiply....this is like a direct proportion problem....and your solving for one of the unknowns....lets call our unknown(?)...z
:

:
to solve for z just cross multiply the -7yt term with the 18xyt term
:

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