1. Mr. Roberts Lunch
Card
How much will Mr. Roberts have after 14 days?
I can calculate y=mx+b from just t wo points.
2. What does the x intercept mean?
What does the y intercept mean?
$$$
days
3. Ugh.... My paper is
to short and I
didn’t find the
answer yet. There
has to be a better
way!
I do remember my
teacher saying
something about base
and rate...
4. Use y=mx+b to
calculate how
much I have after
14 days.
Be prepared to
explain your
reasoning to the
class.
5. Base rate /
slope intercept
y=mx+b
y=rate(x) + base
6. Start Up:
I can write an equation using 2 points
Homework out
Write down Celsius Fahrenheit
everything the X Y
chart tells you and
everything it does
not tell you. Day 1 20 degrees 68 degrees
Can you write an
equation for this?
Day 2 35 degrees 95 degrees
If it is 21 degrees C,
what temperature
is it in Fahrenheit?
8. What is the “per” (rate)?
It is ALWAYS:
Y/X
Y PER X
$$$ per day
9.
10.
11.
12.
13. Write down how you find the equation
if you are given t wo numbers.
(24, 20)
(27, 25)
14. Start Up:
I can write an equation using 2 points
Homework out
Write down Celsius Fahrenheit
everything the X Y
chart tells you and
everything it does
not tell you. Day 1 20 degrees 68 degrees
Can you write an
equation for this?
Day 2 35 degrees 95 degrees
If it is 21 degrees C,
what temperature
is it in Fahrenheit?
15. Temperature is Linear! What is the conversion Equation?
Celsius F=
Fahrenheit
X 99
Y
85
Day 1 20 degrees 68 degrees -47
-30
-56
Day 2 35 degrees 95 degrees 56
72
Day 3 -11 ?
