Question

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

Answer 1

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.

Answer 2

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

Answer 3

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

Answer 4

Haha, Okay. I shall explain more clearly.

Answer 5

i think i got it though

Answer 6

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

Answer 7

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

Answer 8

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.

Answer 9

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

Answer 10

Okay.

Answer 11

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.

Answer 12

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

Answer 13

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

Answer 14

Ahhh my apologies.