maddy21
slope intercept form the equation of the line passing through the points (2.3) (-4.5)
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campbell_st
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can you find the slope of the line..?
maddy21
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yes
campbell_st
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ok... so what did you get for the slope...?
maddy21
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|dw:1359752467738:dw|
campbell_st
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ok... so the slope intercept form of a line is
y = mx + b m is the slope and b is the y- intercept
simplifying the slope it becomes - 1/3
so you have
y = -1/3 x + b
pick either point.... and substitute it into the equation to find b.
if you choose (2, 3) substitute x = 2 and y = 3 into the equation
and solve for b
so
3 = -1/3 (2) + b
can you do that..?
maddy21
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ill try
campbell_st
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try and leave your answer as a fraction
campbell_st
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oops... it will be a mixed number... for b
maddy21
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|dw:1359752864385:dw|
maddy21
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hehe i think im wrong
campbell_st
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ok... so simplified the slope
|dw:1359753073245:dw|
so what do you think the equation is given the slope is -1/3 and b = 3 2/3
maddy21
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how did u get 1/3?
campbell_st
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you said the slope is -2/6 which is the same as - 1/3 take out the common factor of 2
so your equation is
\[y = \frac{-1}{3} x + 3 \frac{2}{3}\]
maddy21
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i thought its 11/3