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Agree . . . or Disagree?

1. Work with your partner to decide whether you agree or disagree with each answer/solution presented.

2. Write “A” for agree or “D” for disagree on your whiteboard – write it large!

3. Be prepared to explain your choice if called upon.

How it works:

Following is the graph for x < 102

102

 

#1

DisagreeThe arrow should point to the left

Following is the graph for

x ≥ 2.6

2.6

#2

Agree

#3A new gaming web site permits young players to play for no more than 30 hours per week. The following inequality represents this situation:

x < 30

DisagreeThere should be a bar under the “less than” symbol to indicate that 30 is a

solution.

#4

www.presentationmagazine.com

t - .48 = 5.2 + .48 +.48 t = 10

DisagreeYou need to line up the decimals

before adding. The solution is 5.68

Madison is a very picky babysitter. She will not babysit for less than $30 for the entire job. The following inequality represents this situation:

b ≥ $30

 

#5

AgreeIf the wording is tricky, think about the

solutions. Will she babysit for $30? Yes. Will she babysit for $31? Yes. For $29? No.

Dylan has invited 8 friends to his party. His parents say he may invite six more. The following equation and solution represent t, the total number of friends Dylan may invite:

t – 8 = 6

t = 14

Dylan may invite14 friends in all

#6

Agree

#7Alexis and Galilee are competing to see who reads the most book pages in a month. Alexis knows that she reads 15 pages a day. She wrote an equation to represent the number of pages she reads in any number of days. She told Galilee:

x, the independent variable, is the # of days.

Agree

#8

www.presentationmagazine.com

The table below fits this equation:y = 0.75x

DisagreeWhen x = 4, y = 3, not 3.5

x 1 2 4 6y 0.75 1.50 3.50 4.50

Sarah bounced a basketball 195 times in three minutes. Her P.E. teacher said this equation would determine how many times Sarah can bounce a basketball in one minute:

3b = 195

 

#9

Agree

The equation that represents this graph is:

#10

Disagree.

Correct equation:y = 7x

Check y at several values of x. For example when

x =2, y = 14 and when x =3, y = 21.

y = 9x

#11If students earned $10/hour washing cars, this graph would be steeper.

Agree

#12

www.presentationmagazine.com

In this graph, the number of cars washed is the independent variable and is on the x axis.

Agree

We want students to play actively at least 102 minutes each week. This is represented by the following graph:

#13

DisagreeThe circle should be closed to

indicate that 102 is a solution of the inequality.

102

CHALLENGE:

Andrew runs a mile in six minutes, which is twice as fast as his little brother runs a mile. He says you could use the following equation, where b = his little brother’s pace, to figure out how fast his brother runs:

b/2 = 6

 

#14

Agree. His little brother takes 12 minutes to run a

mile.