5/30/2014
Friday, 5/30
Remember that TODAY is the last day
for late or make-up work!
Textbook and your work from yesterday – it’s ok if you
didn’t bring it.
Leave the desks scooted
Our Chapter 5 Mini-Test will be on
Tuesday. It will be 5-10 questions.
Is this a proportional relationship?
Is this a proportional relationship?
Is this a proportional relationship?
y = 5x
1
5/30/2014
Is this a proportional relationship?
y = 5x +1
Pg. 257#4-6,27
Use graph paper for graphs – you
should have 3 graphs for this
classwork!
To graph, pick input values randomly
(don’t pick annoying numbers that
won’t fit on your graph)
Now you get to practice the art of
choosing NICE PRETTY numbers…
For example, when you are
multiplying everything by ½, try
only plugging in EVEN numbers.
They are easy to take half of.
Pg. 257#4-6, 27-33
Pg. 257#4-6, 27-33
2
5/30/2014
5-3 Part 2
Extended Learning Goals:
LG #3: Slope
The slope of a graph of a proportional relationship
is the rate of change, or unit rate.
3. I will be able to find slope/rate
of change from a graph or table
It is the simplified rate of y/x in a proportional
relationship.
4. I will use slope/rate of change to
solve problems.
Copy
Copy
Ex. 1:
Slope is ONLY y/x if the relationship
is proportional!
It gets more complicated if it is not
proportional – you will learn about
that next year!
What is the slope of this function?
Copy the work only
3
5/30/2014
Copy and label
Copy and label
Different Slopes
Different Slopes
(if we don’t ask for a specific number)
zero
positive
undefined
negative
Ex. 2:
Find the unit
rate for this
function.
Copy the work only
Slope and unit rate are the same thing
for a proportional function!
Ex. 2:
Find the slope
for this
function.
Copy the work only
Ex. 2:
In a
proportional
function, if
you know the
slope you can
write the
equation for
the function.
Copy the work only
4
5/30/2014
Ex. 2:
In a
proportional
function, if
you know the
slope you can
write the
equation for
the function.
Find the unit
rate for this
function.
y = 4x
Copy the work only
Find the slope
for this
function.
Write the
equation for
this function.
Write the
equation for
this function.
Ex. 3:
y = 2x
Don’t copy the question, silly
5
5/30/2014
x = input, or time
y = output, or distance
Copy the x and y definitions!
6