Question

Which of the following will give you the incorrect slope?
1) y2-y1 over x2 - x1
2) y2-y1 over x1 -x2
3) y1 - y2 over x1 - x2
4) rise over run

Answer 1

the incorrect one
which one is incorrect ???

Answer 2

I just said...

Answer 3

Or just take two points and input them into all the possible outcomes, and see which one does not match the original formula.

Answer 4

okay, let's take the point (2,3), (4,5)

Answer 5

And then input these two points into ALL your choices. all your choices should match the original slope except one.

Answer 6

so what the incorrect one ???

Answer 7

let's go 1 by 1. use point (2,3) , (4,5) \[m=\frac{ y_{2}-y_{1} }{ x_{2}-x_{1} } = \frac{ 5-3 }{ 4-2 }=\frac{ 2 }{ 2 }=1\] so our slope should equal 1.
1) y2-y1/x2-x1 = 1, plugging in points for our original. RIGHT
2) y2-y1/x1-x2 = (5-3)/2-4 = 2/-2 = -1 INCORRECT
3) y1-y2/x1-x2 = (3-5)/(2-4) = (-2/-2) = 1 RIGHT
4) y1-y2/x1-x2 = (3-5)/(2-4) = (-2/-2) = 1 RIGHT

Answer 8

ok thank you

Answer 9

Yep.