Grade 8 | Unit 6: Associations in Data | Check Your Readiness (A)

A line contains the points ("−3,−2") and (7,2). Without doing any calculations, determine whether the slope of this line is positive or negative. Explain or show your reasoning.

• The slope is positive. One way to see this is to plot the two points. Another is to note that as the x-coordinate increases, the y-coordinate also increases.

• The slope is negative.

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8.F.B.4

A line contains the points ("−3,−2") and (7,2). Calculate the slope of the line.

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8.F.B.4

Diego has some money in his bank account before he starts a summer job. He deposits the money from the summer job in his bank account and doesn’t spend any of it. After working 3 hours, he has $71 in the account. After working 12 hours, he has $134 in the account. How much money does Diego earn per hour?

• $7

• $8

• $9

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6.RP.A.3.b

Here is a graph showing the balance in someone's savings account since the beginning of the year. Write an equation for the line shown on the graph.

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8.EE.B.6

8.F.B.4

Here is a graph showing the balance in someone's savings account since the beginning of the year. What does the slope mean in the situation?

• The slope of -4 means this person is spending $4 per week.

• The slope of -4 means this person is saving $4 per week.

• The slope of 4 means this person is spending $4 per week.

• The slope of 4 means this person is saving $4 per week.

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8.EE.B.6

8.F.B.4

Here is a graph showing the balance in someone's savings account since the beginning of the year. What does the vertical intercept mean in the situation?

• The vertical intercept of 110 means this person started the year with $110 in the account.

• The vertical intercept of 110 means this person ended the year with $110 in the account.

• The vertical intercept of 70 means this person started the year with $70 in the account.

• The vertical intercept of 70 means this person ended the year with $70 in the account.

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8.EE.B.6

8.F.B.4

In many schools, students have the choice between taking art, music, or some other elective. At Euclid Middle School, there are 200 students in the 8th grade. 40 students are taking art. What percentage of 8th graders at Euclid Middle School are taking art? Explain or show your reasoning.

• 20%

• 25%

• 30%

• 35%

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6.RP.A.3.c

In many schools, students have the choice between taking art, music, or some other elective. At Newton Middle School, there are 320 students in the 8th grade. 54 are taking music. What percentage of 8th graders at Newton Middle School are taking music? Explain or show your reasoning.

• 16.875%

• 20%

• 15.625%

• 18.75%

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6.RP.A.3.c

Students voted for their favorite entry in a Halloween costume contest. Jada recorded the results in a bar graph. Who got more votes: the angel or the zombie?

• The zombie

• The angel

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2.MD.D.10

Students voted for their favorite entry in a Halloween costume contest. Jada recorded the results in a bar graph. How many votes did the vampire get?

• 18 votes

• 20 votes

• 16 votes

• 22 votes

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2.MD.D.10