sonja_lee2
Find the slope of the line passing through the given points. Then tell whether the line falls, rises, is horizontal, or is vertical. (14,3),(4,11)



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Hero
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Are you familiar with y = mx + b?

sonja_lee2
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yes

sonja_lee2
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i know how to find the slope i just dont know how to find out whether if it falls, rises that stuff

Hero
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Okay, good, now, I'm going to simply plug each point into that formula:
3 = 14m + b
11 = 4m + b
Are you with me so far?

sonja_lee2
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yes

Hero
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Okay, m is the slope, so I'm going to isolate b in both equations:
b = 3  14m
b = 11  4m
Do you see how I got that?

sonja_lee2
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kinda

Hero
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It takes a little practice to understand it, but now I'm going to set
b = b
to get:
3  14m = 11  4m

Hero
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Now all I have to do is solve for m:
3  11 = 14m  4m
14 = 10m
14/10 = m
 7/5 = m

Hero
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There we go

sonja_lee2
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ok i was wait thats not right

Hero
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You entered the answer as soon as I posted it, lol

sonja_lee2
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kk i got that too

sonja_lee2
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haha yeah

Hero
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You shouldn't enter the answer so fast :P I guess I can take my own advice in that regard.

sonja_lee2
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okay

Hero
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Sometimes, I make typos, so you should wait at least one minute after someone posts their answer.

sonja_lee2
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um ok

Hero
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My fingers are not as bright as my brain

Hero
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Sometimes, my fingers hit keys they shouldn't.

sonja_lee2
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oh okay its a

sonja_lee2
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all G

Hero
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By the way,
If the slope is NEGATIVE, it FALLS
If the slope is POSITIVE, it RISES

sonja_lee2
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always?

Hero
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If something falls, it's always going down, right?
If a plane rises from the ground, it is always going up, right?

sonja_lee2
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right

Hero
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dw:1348449900048:dw

sonja_lee2
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ohh i see

Hero
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Yeah just think about a plane either taking a nose dive or lift off

sonja_lee2
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ohh okay thank u!

Hero
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dw:1348450045305:dw