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Mathematics 20 Online
OpenStudy (anonymous):

This is bothering me. Should the answer be y=-x+3 because the slope is going down down three and over to the left three meaning it'll be -3/3=-1 aka -x? Here is the graph: http://i.imgur.com/EvrzW1I.png

jimthompson5910 (jim_thompson5910):

|dw:1436593889252:dw|

jimthompson5910 (jim_thompson5910):

|dw:1436593898587:dw|

jimthompson5910 (jim_thompson5910):

negative slopes look like this |dw:1436593957282:dw|

OpenStudy (anonymous):

I thought I had to go up three because of the y-int and then come down from there

jimthompson5910 (jim_thompson5910):

that +3 is where you start on the y axis you go up 1, to the right 1 to jump to the next point the slope is actually +1 and not -1

OpenStudy (anonymous):

Hmm alright. Well thank you very much! Have a good night!

jimthompson5910 (jim_thompson5910):

slope = rise/run = 1/1 = 1 |dw:1436594102303:dw|

jimthompson5910 (jim_thompson5910):

no problem

OpenStudy (anonymous):

Hold on

OpenStudy (anonymous):

So I don't have to start at that +3?

OpenStudy (anonymous):

I start at the -3 on the X axis?

jimthompson5910 (jim_thompson5910):

you start at (0,3) which is +3 on the y axis (the vertical axis)

jimthompson5910 (jim_thompson5910):

|dw:1436594256975:dw|

OpenStudy (anonymous):

and the do I go down one down and one over from there?

jimthompson5910 (jim_thompson5910):

always move from left to right we move 1 unit up (rise) and 1 unit to the right (run) which is why slope = rise/run = 1/1 = 1

OpenStudy (anonymous):

OOOOOOOH

OpenStudy (anonymous):

I have to go up not down - I feel dub now xD

jimthompson5910 (jim_thompson5910):

well you only go down if the slope happened to be negative

OpenStudy (anonymous):

Thank you! This time for real (:

jimthompson5910 (jim_thompson5910):

you're welcome

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