Quick 'simple' algebra question (from QR prometric)

[rhodes1210]

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If y = (x + 2)/x, than x equals which of the following?

A. 2/(y-1)

B. 2/(y+1)

C. (2y+1)/y

D. 2y-1

E. y/(y+2)

For some god forsaken reason, I just can't get one of these answers!! Maybe it's because I'm swamped from studying today, but it would help me feel a whole lot better if someone would please help answer this question...

 

[shonster460]

You can split the fraction since there is only one term in the denominator.

(x+2)/x = 1+2/x

So,
y=1+2/x
y-1 = 2/x
x(y-1)=2
x=2/(y-1)

 

[FOX_ONE]

trick is to substitute out a variable
youll end up with xy = x + 2 after one step

then subtract that x on the right side

xy - x = 2

substitute out that x

x(y-1) = 2

then finish it up.

bro just practice qr sections and youll start belting these things out like no other.

30s on QR sections are not impossible.

 

[rhodes1210]

Thanks guys!