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Mathematics 7 Online
OpenStudy (anonymous):

help is this right y = 3x + 3

jimthompson5910 (jim_thompson5910):

As you go from left to right, the line is falling. So the slope is negative.

jimthompson5910 (jim_thompson5910):

y = 3x + 3 has a positive slope

jimthompson5910 (jim_thompson5910):

So y = 3x + 3 is incorrect.

OpenStudy (anonymous):

is it this one

jimthompson5910 (jim_thompson5910):

what is the y-intercept of y = 3x + 3 ?

OpenStudy (anonymous):

what do you mean

jimthompson5910 (jim_thompson5910):

are you familiar with y = mx+b form?

OpenStudy (anonymous):

yea

jimthompson5910 (jim_thompson5910):

what is m?

OpenStudy (anonymous):

that what I have trobel with how to put them together

OpenStudy (anonymous):

will you help me with that

jimthompson5910 (jim_thompson5910):

m is the slope b is the y-intercept

jimthompson5910 (jim_thompson5910):

so something like y = 7x + 10 is of the form y = mx+b where m = 7, b = 10

jimthompson5910 (jim_thompson5910):

So the slope of y = 7x + 10 is 7 and the y-intercept is 10

jimthompson5910 (jim_thompson5910):

See how I'm getting this?

OpenStudy (anonymous):

yea

jimthompson5910 (jim_thompson5910):

so what's the slope of y = 3x + 3?

OpenStudy (anonymous):

(0,3).

OpenStudy (anonymous):

is it ??

jimthompson5910 (jim_thompson5910):

that would be the y-intercept actually

jimthompson5910 (jim_thompson5910):

the slope is a fraction or a single number

OpenStudy (anonymous):

3

jimthompson5910 (jim_thompson5910):

so look at the graph and tell me where it crosses the y axis

OpenStudy (anonymous):

what do you mean

jimthompson5910 (jim_thompson5910):

that last graph you gave me, tell me where it crosses the y axis

OpenStudy (anonymous):

|dw:1394495381758:dw| well it look like this ok but like what do you mean it crosses the y axis

jimthompson5910 (jim_thompson5910):

the y axis is this vertical axis |dw:1394495497451:dw|

jimthompson5910 (jim_thompson5910):

see how the line crosses the y axis here |dw:1394495526301:dw|

OpenStudy (anonymous):

on 2

jimthompson5910 (jim_thompson5910):

so the y-intercept of that graph you have is 2

jimthompson5910 (jim_thompson5910):

but wait...the y-intercept of y = 3x + 3 is 3 or (0,3)

jimthompson5910 (jim_thompson5910):

so y = 3x+3 does NOT match up with that last graph you posted

OpenStudy (anonymous):

ook thanx

jimthompson5910 (jim_thompson5910):

you're welcome

OpenStudy (anonymous):

:)

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