Lines of Best Fit
Mean & Median
Graphing Lines
Solving Equations
Solving Systems
200
What is the equation for the line of Best Fit seen below?
What is y = -1/2x + 8?
200
Fern Creek High School promoted a can drive for families in need. If the Freshman Academy brought in 528 cans, the Tech Academy brought 412 cans, the Communications Academy brought 253 cans, and the Education Academy brought 147 cans, what is the MEAN number of cans brought in by each academy?
What is 335 cans?
200
Graph the line y=2x + 5.
Start on y-axis at (0, 5)
Move up 2, right 1.
200
7x + 3 = 2x + 13
What is 2?
200
Solve using Elimination:
3x + y = 5
2x - y = 0
What is (1, 2)?
400
A zoologist studying tadpoles looks to see if there is a relationship between a tadpole's age in days and its tail length in mm. The line of Best Fit for his data is y= -1.3x + 17.5. Predict the tail length of a tadpole whose age is 12 days.
What is 1.9 mm?
400
Carlos has 6 trees in his backyard and the following are the heights of each in feet:
13, 11, 8, 15, 2, 5
What is the MEDIAN tree height?
What is 9.5 feet?
400
Graph the line y= 1/2x + 2.
Start on the y-axis at (0, 2)
Move up 1, right 2.
400
-3x - 32 = -10 + 8x
What is -2?
400
Solve by Equal Values:
y= -4x - 9
y= x + 6
What is (-3, 3)?
600
Ms. Demeanor studied the relationship between one's arm length in cm (x) and their height in cm (y). The line of best fit is given by the equation: y= .95x + 9.4. Interpret the slope in context.
What is for every 1 cm in arm length, height increases by .95 cm?
600
The following are scores from an English test given by Ms. Fortune yesterday:
89, 80, 85, 83, 70, 100, 95
What is the MEAN score of this group of students?
What is 86?
600
Graph the line y= -2/3x - 4.
Start on the y-axis at (0,-4)
Move down 2, right 3 OR
Move up 2, left 3.
600
-19x + 32 = -24x - 3
What is -7?
600
Solve by Elimination:
12x - 9y = 30
-12x - 20y = 28
What is (1, -2)?
800
The average number of pages read to a child each day (x) and the child’s growing vocabulary (y) are measured. The line of best fit is found to be y=14.87x+30.26. Interpret the y-intercept in context.
What is a child's vocabulary will only be 30.26 words if they have 0 pages read to them?
800
The front row of the movie theater near you has 23 seats. If you were asked to sit in the MEDIAN position, which seat would you occupy?
What is 12?
800
Graph the line 4x + 2y = 8.
x-int. (2,0)
y-int. (0, 4)
800
2(x - 5) = 5x + 23
What is -11?
800
Solve by Substitution:
x = -3y + 1
-3x - 3y = -15
What is (7, -2)?
1000
Mr. Cannon researched the average price of a major league baseball ticket from the years 1997-2006 and came up with the following line of Best Fit equation: y=1.15x - 2283.55. Use this to predict the average cost of a ticket in the year 2009.
What is 26.80?
1000
The following data are related to the heights in inches of some high school champion basketball players in Chicago.
80, 81, 84, 74, 76, 73, 78
What is the MEAN height AND the MEDIAN height of this group of players?
What is 78?
1000
Graph the line -3x + 6y = -12.
x-int. (4, 0)
y-int. (0, -2)
1000
6y - 10y - 11 = 8y - 2y + 29
What is -4?
1000
Solve by Substitution:
-3x - 3y = 3
y= -5x - 17
What is (-4, 3)?