what is the slope of the line though the points (7,9) and (4,9) Is it 3?

Slope says, "for every change in x, how much does y change?". Look at those points' x and y values. Their x values change, but what about their y values? It doesn't. For every change in x, which we don't even need to calculate, y doesn't change. Slope is 0.

Use the equation: y2-y1 ----- x2-x1 as (7,9) = (x1,y1) and (4,9) = (x2,y2)

sorry but none of your answers were very helpful. :(

Haha, Okay. I shall explain more clearly.

i think i got it though

Do you know what slope is? So I know where to start explaining.

yes, i understand everything, i looked at my notes lol

Then why can't you do this problem? If you understand everything about slope you shouldn't be having any trouble. Tell me what slope is.

i didn't understand it at first, but now i do :)

Okay.

The equation we use to find the slope of any two given points is: y2-y1 ----- x2-x1 In your problem, the two given points are: (7,9) which stands for (x1,y1) in the formula above and (4,9) which stands in susbtitution for (x2,y2) in the formula above. Hence: y2-y1 9 - 9 0 ----- = ---- = --- = 0 x2-x1 4 - 7 -3 0 Makes your slope undefined. And thus, "undefined" is your final asnwer.

Here's a lesson I created a while ago. It includes additional and further steps into the "slope concept" http://openstudy.com/users/katrinakaif#/updates/4e40d9700b8b811ce54a1a01

A line can have 0 slope. 0/-3 = 0. The slope of vertical lines is undefined, not horizontal lines.

Ahhh my apologies.

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