Choose the equation below that represents the line passing through the point (2, -5) with a slope of -3
These are the options :
a. y = -3x - 13
b. y = -3x + 11
c. y = -3x + 13
d. y = -3x + 1
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OpenStudy (anonymous):
Please Help?
jigglypuff314 (jigglypuff314):
slope-intercept form: y = mx + b
when m = slope and b = y-intercept
given slope was -3
so plug in as m = -3
to get y = -3x + b
follow so far? :)
OpenStudy (anonymous):
Not at all lol i'm confused
OpenStudy (anonymous):
Is it y= -3x + 11 ?
OpenStudy (anonymous):
First part
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jigglypuff314 (jigglypuff314):
there is a format called "the slope intercept form"
that looks like y = mx + b where m and b are numbers
and m would represent the slope
OpenStudy (anonymous):
So y = -3x + 11 ?
jigglypuff314 (jigglypuff314):
not quite :)
y = -3x + b
to find the value of that ^ number
temporarily plug in point (2, -5) as (x, y) into the equation
so solve for " b " for -5 = -3(2) + b
OpenStudy (anonymous):
My bad i think is y = -3x - 11 ?
jigglypuff314 (jigglypuff314):
-5 = -3(2) + b
-5 = -6 + b then add 6 to both sides
so b = -5 + 6 = ?
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OpenStudy (anonymous):
is it y = 3x -11.. Honetsly im completely lost :/
OpenStudy (anonymous):
i'm not good at math
jigglypuff314 (jigglypuff314):
it's alright :)
just do -5 + 6 = ?
OpenStudy (anonymous):
-5 + 6 = 1
jigglypuff314 (jigglypuff314):
yup :)
so we got from -5 = -3(2) + b to --> b = 1
so y = -3x + b
and since b = 1
y = -3x + 1
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