Mathematics
7 Online
OpenStudy (anonymous):
help is this right
y = 3x + 3
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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 ?
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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
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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?
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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
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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
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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
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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):
:)