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Pre-Algebra 21 Online
OpenStudy (haileyd):

Find the slope..

OpenStudy (haileyd):

OpenStudy (tkhunny):

Put down a basketball and see which way it rolls!

OpenStudy (haileyd):

huh??

OpenStudy (tkhunny):

Oh, you have points! I got in there a little too soon. What is slope? Have you seen these? \(Slope=\dfrac{Rise}{Run} = \dfrac{Change\;in\;y}{Change\;in\;x} = \dfrac{\Delta y}{\Delta x} = \dfrac{y_{2} - y_{1}}{x_{2}-x_{1}}\) One of those almost has to be familiar. ALL definitions of slope.

OpenStudy (haileyd):

yup its familiar..

OpenStudy (tkhunny):

Okay, what's preventing you from doing it? You have two points (well, two pair). What is the slope represented by each pair?

OpenStudy (haileyd):

I did it but my answer came out wrong..so i messed up somewhere..

OpenStudy (tkhunny):

Okay, please demonstrate. (-3,2) and (2,2)

OpenStudy (haileyd):

So i would subtract all of the x/y and i got 5 and 0 so i put 0/5 but i was 0 so i dont understand why i woulndt use the 5 also.

OpenStudy (tkhunny):

\(\dfrac{2-2}{2-(-3)} = \dfrac{0}{5} = 0\) It's just zero. It is unlikely that an automated answer checking system would appreciate the division symbol or anythign in the denominator. 0/5 is the same as just 0, but I doubt it has been programmed to be accepted. For one thing, it's confusing. 0/5, 0/6, 0/(-3), 0/103 -- They are all zero. It is not helpful to have a 5, even if that where it came from in this case. Additionally, it demonstrates additional understanding if you can just let the 5 go. It doesn't much matter what's in the denominator if 0 is the numerator. (With one exception.)

OpenStudy (haileyd):

Ok i think i get that..Thanks.

OpenStudy (tkhunny):

Good work. Keep demonstrating that additional understanding!

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