evaluate xy - y/x for x = 6 and y = 12

Star eyes

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May 4, 2006
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xy- y/x for x=6 and y=12. I know the answer is 70 but I don'y understand how they get the answer. thanks for your help.
 
Plug in 6 for all the x's you see and 12 for all the y's you see and solve. Nothing too hard. 8-)
 
Star eyes said:
xy- y/x for x=6 and y=12. I know the answer is 70 but I don'y understand how they get the answer. thanks for your help.

Do you mean this?
(xy - y) / x

Or do you mean this?
xy - (y/x)

It DOES make a difference!

Substitute 6 for x and 12 for y, and do the arithmetic. But, be sure that you are following the correct order of operations, depending on what your original expression really was.
 
Do you mean this?
(xy - y) / x

Or do you mean this?
xy - (y/x)

It DOES make a difference!

Ok, Yes they do make a difference

(xy - y) / x = (6 * 12 - 12) / 6 = (72 - 12) / 6 = 60 / 6 = 10
xy - (y/x) = 6 * 12 - 12 / 6 = 72 - 2 = 70

So I'm guessing it's the second equation
Sorry I gave out the whole answer, hope you understand the concept :)
 
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