Change of Subject of a Formula

Which of the following has "a" as the subject of the formula?

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Tags

CCSS.HSA.CED.A.4

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If 2x - 3y = 6z, then y =

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If x = 9 (y + z), then y =

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Make x the subject of the formula. $x\left(y-1\right)=y\left(1-x\right)$  

•  $\frac{y\left(1-x\right)}{y-1}$  

•  $\frac{x\left(y-1\right)}{1-x}$  

•  $\frac{2y-1}{y}$  

•  $\frac{y}{2y-1}$