Quick math question

[steelrfan8]

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I'm usually a lurker here but usually see people ask questions so I figured I give it a shot on a problem I'm stuck on... I'm must be having a serious brain fart because I usually solve these types of problems fast but something isn't clicking on this problem from the Baron's DAT practice exam

y = (x+4)/(x-1) What does x represent?

I start off with (x-1)y = x+4

then xy-y = x+4

then xy - x = 4+y

x(y-1) = 4+y

x = (4+y)/(y-1) .... none of the choices are close so I must be way off for some reason which I can't seem to figure out.

Any help would be appreciated.

 

[Streetwolf]

I'm usually a lurker here but usually see people ask questions so I figured I give it a shot on a problem I'm stuck on... I'm must be having a serious brain fart because I usually solve these types of problems fast but something isn't clicking on this problem from the Baron's DAT practice exam

y = (x+4)/(x-1) What does x represent?

I start off with (x-1)y = x+4

then xy-y = x+4

then xy - x = 4+y

x(y-1) = 4+y

x = (4+y)/(y-1) .... none of the choices are close so I must be way off for some reason which I can't seem to figure out.

Any help would be appreciated.

y(x-1) = x+4
xy - y = x + 4
xy - x = y + 4
x(y - 1) = y + 4
x = (y+4) / (y-1)

What are the choices?

 

[steelrfan8]

y(x-1) = x+4
xy - y = x + 4
xy - x = y + 4
x(y - 1) = y + 4
x = (y+4) / (y-1)

What are the choices?

The choices are :

a) (3y)/(y+1)

b) (3y+2)/(y-1)

c) (3y+2)/👍

d) (3y-2)/(y+2)

e) (3y-2)/(y-1)

It seems like you did the problem the same way as me, I solved a lot of these types of problems and I don't get why the answers are so far off

 

[zuma35]

The choices are wrong. Plug in a number.