Exam 3: Thinking Linearly

Find the slope and y-intercept, and use them to sketch the graph. y = -4x + 21

Write a variation model. Use k as the constant of variation. the distance (d)traveled by an object varies directly as the average speed (v)

Find the slope and y-intercept of the equation.

Does the line pictured below have positive, negative, zero, or undefined slope?

Find the slope and y-intercept, and use them to sketch the graph.

Solve the system using the substitution method.

Which is the graph of 5x + 2y = 100?

True story from Erin's life: My 4-month old daughter got her shots, and we ended up needing to give her some tylenol for the pain. Infant Tylenol comes in liquid form, and the box indicates that there are 160 mg of acetaminophen per 5 mL of liquid. a. Complete the table, and then use it to draw a graph, where x is the amount of infant Tylenol in mL and y is the amount of acetaminophen in mg. b. Is this a direct variation relationship? Why or why not? Be specific. c. Find the slope of the line you graphed and explain what it means. d. Write a linear equation that describes the amount of acetaminophen in mg (y)in terms of mL of infant tylenol (x). e. In spite of the handy SimpleMeasure syringe, the directions don't give a dosage for children under 2 years old. This is because it depends on weight and they want you to call the doctor so you don't get the math wrong. But I'm a math teacher, so I looked it up. For my daughter's weight at that time, the dosage is 115 mg of acetaminophen. How many mL of infant Tylenol did I need to give her?

Determine if the given point is a solution to the system.

Solve the system using the graphing method.

Solve the system by graphing.

Graph the line by making a table of ordered pairs and plotting the points. 3x + 2y = -11.

Find the slope and y-intercept, and use them to sketch the graph. y = -4x + 21

Find the slope and y-intercept, and use them to sketch the graph.

Of all the topics we have covered in unit 3, what has stood out to you as something most relevant to your life? Explain why.

Find the constant of variation, k . a varies directly as b and a is 27 when b is 36 .

Solve the system using the substitution method.

Find the slope of the line connecting the points

Solve the system by graphing.

Which point is a solution to the system?