Quantitative Aptitude Algebra Linear Equation in 2 Variable

If \(\frac{2}{a-1}=\frac{4}{y}\), and y ≠ 0 where a ≠ 1, what is y in terms of a?

1
\(y=\frac{2a-1}{2}\)
2
y = 2a − 4
3
\(y=\frac{1}{2a+1}\)
4
y = 2a − 2 
5
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