why does it go like y=(40+3x)/3?

Peter Rosas

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[Originally tacked onto the end of this thread. -- stapel]

My teacher left the answers of the odd numbered questions like it does in the book. But why does it go like y=(40+3x)/3? Shouldn't it be 40/x+3?
 
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why does [my teacher's answer] go like y=(40+3x)/3?

Shouldn't it be 40/x+3?

Hi Peter:

Did you type your teacher's answer correctly? The 3 highlighted in red above is not correct; that denominator needs to be x instead of 3.

The expressions (40 + 3x)/x and 40/x + 3 are equivalent. If we do the division by x in the first expression, we get the second. So, either of these expressions may be used to find the value of y when x is 5.


Try it, and see!

First version: y = (40 + 3*5)/5

Second version: y = 40/5 + 3

:)
 
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