What is the Rate of Change?
Slope and Slope-Intercept Form
Graphs
Direct Variation
Mixed Review
100
A car accelerates to 30 mph in 180 feet.
What is 1 mph for every 6 feet?
100
Calculate the slope.
(2,-3) and (5,-15)
-4
100
What is the rate of change?
$100 per deposit
MYSTERY 2 of 5: For mystery #2, write the formula for slope.
100
If y=2x and x=4, what is y?
8
100
What is the direct variation formula?
y=kx or y=ax
200
3 bags of oranges cost $6.75 and 5 bags of oranges cost $11.25.
What is $2.25 per bag of oranges?
200
Calculate the slope.
(-2,-9) and (-7,-21)
12/5
200
What is the slope?
-1/2
200
y=42 and x=6. Write the direct variation equation.
y=7x
MYSTERY 3 of 5: For mystery #3, write the name of your favorite math topic/unit.
200
Identify the slope and y-intercept. y = 3 - 4x
slope is -4 and y-intercept 3
300
A swimming pool has 200 gallons of water and then 8 minutes later it has 360 gallons of water.
What is 20 gallons of water per minute?
300
Solve for y. (write your answer in slope-intercept form)
-7x+35= -5y
y = 7/5x - 7
MYSTERY 1 of 5: In the email with your packet answers, number your mystery answers from 1-5. For mystery #1 write the title of your favorite book.
300
What is the rate of change?
-$50 per month
300
y=x/5 What is k?
1/5
300
What is y?
(8,-3) and (10,y) when the slope is 5/2.
What is y=2?
MYSTERY 4 of 5: For mystery #4 write an equation in slope-intercept form.
400
Brian has typed 32 words. 2 minutes later he has typed 68 total words.
What is 18 words per minute?
400
solve for y. (write your answer in slope-intercept form)
5x+2y= 30
y= -5/2x+15
400
Write the equation for this graph in slope-intercept form
y= -1/2 + 3
400
y=1/3 x=1/2 What is k?
2/3
400
What is the x-intercept of the equation y = 5x-10?
Remember: To get the x-intercept you need to substitute 0 in for y and solve for x.
x= 2 or (2,0)
500
An employee earns $28.50 after 3 hours and $237.50 after 25 hours.
What is $9.50 per hour?
500
solve for y. (write your answer in slope-intercept form)
-3/4x+1/2y= -1
y=3/2x-2
500
Write the equation for this graph in slope-intercept form
y = 5x + 30
500
DOUBLE JEOPARDY!
y=1/4 and x=1/8. Write the direct variation equation.
y=2x
500
What is the x-intercept of the equation y = 4x-33?
Remember: To get the x-intercept you need to substitute 0 in for y and solve for x.
x= 33/4 or (33/4,0)
MYSTERY 5 of 5: For mystery #5, write an equation for a line with your favorite number as the y-intercept and use your 2 favorite letters for the variables.