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February 22, 2018
1.) y = 4x + x + 3 5.2. A man travels at a rate of 2.5 m/s for 30 sec.
3.
4. (8, 2) & (4, 7)
Warm upFind the slope (coefficient, rate, ratio, rise/run).
Tyler, Kayden, & Brynn
Wobble chairs go to:
February 22, 2018
Content Objective: • I can find the slopes or rate of a
proportional relationship in any form. Language Objective: • I can use terms like linear relationship,
coefficient, rate, constant, and slope, correctly.
Lesson 9.2C
Assignment: 9.2C Due__________Quiz on ___________
February 22, 2018
Example 1Three turtles are racing in a 10 meter long race.
Sheldon "runs" at a speed of 2 meters per minute.
Slocome "runs" at a speed of 1 meter per minute. (He is slow to come when called.)
Rocket "runs" at a speed of 2.5 meters per minute.
1.) Complete the table giving the distance each turtle is from the starting line at each time in the race.2.) Write the equation for the distance, d, each turtle is from the starting line at minute, t, of the race.Sheldon: d = ___________ Slocome: d = ___________ Rocket: d = ___________
3.) Circle the name of the turtle who wins the 10 meter race.
4.) Describe the type of relationship each of the equations represents.
5.) Rewrite each equation in the form of = m (or in this case = m)?
Sheldon: ______________ Slocome: ______________ Rocket: ______________
6.) The number that is multiplied by the variable t is called a coefficient, but if you put it in the form of = m, you can see that it is also a rate measured in meter/min. Remember that k could be substituted for m because the relationship is___________________.
yx
dt
yx
Lesson 9.2C Slope practice
I can find the slopes or rate of a proportional relationship in any form. 7.2.2.1
February 22, 2018
Turtle Race
Time (min.)
Distance (m
eters)
Slocome
Sheldon
Sheldon realized that the race was not really fair. So he convinces the others (talks them into) giving Slocome a head start of 6 meters. Rocket suggests that Sheldon should also have a head start (a lead before the race begins) of 1 meter. 7.) Predict how that would change the equations, table and graphs for each turtle?
8.) Fill in the table shown above. Then give the equations for each turtle. Sheldon: d = ___________ Slocome: d = ___________ Rocket: d = ___________
9.) Which equations are proportional?
10.) Which are not proportional? Explain why.
rise change in height run change in horizontal distanceslope = =
10.) Race 1: Sheldon's slope = ______ Race 2: Sheldon's slope = ______ Slocome's slope = ______ Slocome's slope = ______
Rocket's slope = ______ Remember Rocket's graph does not change, because he did not get a head start.Look at the turtle's equations. 11.) Where did you see the slope appear in the equations?
12.) Where does the constant, b, or yintercept show up on the graph?
Find the yintercept for each turtle.13.) Race 1: Sheldon's yint. = ______ Race 2: Sheldon's yint. = ______
Slocome's yint. = ______ Slocome's yint. = ______ Rocket's yint.= ______ Look at the turtle's equations. 14.) Where did you see the yintercept appear in the equations?
Let's make a distancetime graph for each turtle and then you might figure out why the constant is also called the yintercept. The distancetime equations for Sheldon and Slocome in Race 1 have already been graphed for you.
Remember:
Find the slope for each turtle for Race 1 and Race 2.
February 22, 2018
15.) Find the slope and yintercept of each of the graphed lines. Then write the equation for the lines.
slope =
yintercept =
slope =
yintercept =
Write the equation for each of the graphed lines.
A) B)
A) _____________________ B) _____________________
slope =
yintercept =
slope =
yintercept =
Write the equation for each of the graphed lines.
C) D)
C) _____________________ D) _____________________
y
x
y
x
y
x
y
x
February 22, 2018
slope =
yintercept =
slope =
yintercept =
Now graph the lines.
E) F)y = 43x + 2 y = 2
3x + 5
E) F)
slope =
yintercept =
slope =
yintercept =
Now graph the lines.
G) H)y = 6x 1 y = 53x 5
G) H)
y
x
y
x
y
x
y
x
16.) Find the slope and yintercept of each of the equations. Then graph the equations.