Tuesday, 11 October 2016

algebra precalculus - Given fracacdotybcdotx=fracCD, find y.



That's a pretty easy one... I have the following equality : aybx=CD and I want to leave y alone so I move "bx" to the other side



ay=(Cbx)D




and then "a"



y=(Cbx)Da.



Where is my mistake? I should be getting y=(bCx)(aD).



I know that the mistake I am making is something very stupid, but can't work it out. Any help? Cheers!


Answer



No mistake was made. Observe that:
y=(CbxD)a=CbxD÷a=CbxD×1a=CbxDa=bCxaD
as desired.


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