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February 9, 2011
Sections 2.5 and 2.6

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*Sign up* What if Rate of Change is
Constant?
•
If the average rate of change
is ALWAYS the same
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We drop the average
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Say rate of change
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Have a line of that slope
Obj105

Start with Info
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Might have a phone plan
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Pay $20 a month
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$.10 per minute for each call
•
What is the cost if we call for 20 minutes?
–
A:
$22
B: $40
C: $18
D: $21

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*Sign up* Start with Info
•
Might have a phone plan
•
Pay $20 a month
•
$.10 per minute for each call
•
How would we write an equation for this?
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Cost = 20 + .10*Minute
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From verbal description (and information
there) can come up with equation

In General
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y = b + mx
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Output = initial value + slope * Input
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Initial value is the y-intercept (0, init value)
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This form is useful as it is most like the forms that
will come later
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More often written is as y = mx+b
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Called slope-intercept form of the equation
•
From the form of the equation, we can quickly read
off some information

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