Units 3 & 4 Review

Unit 3- Linear Functions

​Slope from Tables and Coordinate Points

Multiple Choice

Determine the slope.

• 4

• -4

• 1/4

• -1/4

​Finding Slope from Graphs

Step 1: Determine whether the slope is positive or negative

Step 2: Find two perfect points. Start at the lowest point and then form a right triangle by doing rise over run.

Step 3: Simplify in your calculator if neccessary.

a

Multiple Choice

Find the slope

• 7/3

• 3/7

• -3/7

• -7/3

Slope from a Verbal Description

Jimmy is renting a car from Turo for the first time. He has to pay a $100 deposit and $75 each day he has the car. Write an equation to find the total cost, t, Jimmy will rent the car for d, days.

Step 1: Identify your slope. Your slope, or "m" will be a variable term (per, each, every). 75

Step 2: Identify your y-intercept. Your y-intercept, or "b" will be your constant (one-time values, starting point, initial value, or additional fees). 100

Step 3: Write the equation in slope-intercept form t=75d+100

Multiple Choice

Write the equation that represents this word problem:

Nora owes her parents $400 for a computer, so she babysits for $10 per hour.

• y= 10x + 400

• y= -10x - 400

• y=10x - 400

• y= -10x + 400

• Answer Not Here

​Direct Variation

Multiple Choice

The amount of money earned on a job is directly proportional to the number of hours worked. If $70.00 is earned in 5 hours, how much money is earned in 22 hours of work?

• $2

• $308

• $1.57

• $265

Unit 4- Forms of Linear Equations & Equations from Data

​Slope from Tables and Coordinate Points

Multiple Choice

Find the slope:
(-1,-9) and (5, -6)

• -15/4

• 1/2

• -3/6

• 11/3

The y-intercept is where x is 0.

The y-intercept is (0,2)

From Coordinates or a Table

The y-intercept is the point where the line crosses the y-axis.

The y-intercept is (0,1)

From a Graph

Y-intercept

Multiple Choice

If m=3 and b=6, what is the correct slope intercept equation?

• y=3-6

• y=3x-6

• y=3x+6

• y=6x+3

Multiple Choice

What is the equation of a line with a slope of 4 and a y-intercept (0,12)?

• y = 4x + 12

• y = 4x + 0

• y = 4x

• y = -4x - 12

Multiple Choice

Write the equation of the line in Point-Slope form that goes through the point (10,5) and has a slope of -3

• y - 5 = -3(x - 10)

• y= -3x + 35

• y + 5= -3(x + 10)

• y= -3x - 35

Multiple Choice

Write an equation  
m = 5 through (-1, -3)

• y = 5x + 2

• y = -5x - 5

• y = -5x + 2

• y = 2x - 5

​Perpendicular Equations

Have the same slope and different y-intercepts

Ex: 3x+4 and 3x-4

Parallel Equations

Parallel vs. Perpendicular Equations

Multiple Choice

Find the slope of a line parallel to the line below.
y = 2x + 4

• 2

• -1/2

• 1/2

• -2

Multiple Choice

Find the slope of a line perpendicular to the line below
y = ½x + 4

• 1/2

• -1/2

• 2

• -2

Multiple Choice

What type of correlation does this scatter plot show?

• positive linear association

• negative linear association

• no association

• nonlinear association

Multiple Choice

Gunderson et al. (2013) found more process praise led to more growth mindset.

• Positive correlation

• Negative correlation

• No correlation

Multiple Choice

The number of smartphones sold and the number of food poisoning cases.

• Positive correlation

• Negative correlation

• No correlation

Multiple Choice

Mrs. Collins made a scatterplot to show the relationship between the number of absences and a student’s final exam score. Based on this scatterplot, a student with 6 absences should get approximately what score on the final exam? 

• 65

• 92

• 70

• 76

Multiple Choice

About how many male math teachers were there in 2006?

• 15

• 30

• 35

• 45