@welshfella find the slope of the line that goes through the following points (i drew the graph let me just post the attachment:) )

Question

anonymous · Answer

attachment

anonymous · Answer

So here we go. 
x1 = -1
y1 = -4
x2 = 0
y2 = -1

anonymous · Answer

so -1 - 0 is -1 
-4 - -1 is  -3

anonymous · Answer

so its -1/-3 (fraction)

anonymous · Answer

Is that correct?

welshfella · Answer

x2  = 2
y2 = 5      that the top point

x1 = -1
y1 = -4   thats the bottom point


slope = y2 - y1  / x2 - x1  =   5-(-4)/ 2-(-1)  = 9/3 = 3

welshfella · Answer

not:- e positive slopes  are like /
negative slopes are like \

anonymous · Answer

Do you have to use specific points here? I'm confused. Is there a rule that you have to use the specific points because I feel like otherwise I'll get it wrong..

welshfella · Answer

its easy to make mistakes with these  - as I did in the last question

welshfella · Answer

no - you can use any 2 points . I just used  top and bottom out of choice

anonymous · Answer

Okay so what mistake did I make when calculating this? If I know what I did wrong I can fix myself next time.

welshfella · Answer

ok lets take a look

welshfella · Answer

you got the 2 points right

welshfella · Answer

y2 - y1 =  -1-(-4) = -1+4 =  3    not -3
x2 - x1 =  0-(-1) = 1

3/1 = 3

anonymous · Answer

So you do Y before X?

welshfella · Answer

yes   
its ( y2-y) /( x2-x1)

anonymous · Answer

Wait so you add something too?

welshfella · Answer

think of it as rise  over run will help

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