Error Analysis Solve Inequalities

At what step did the student make an error?

• Step 1: - p - 4p = -5p²

• Step 1: - p - 4p = 5p

• Step 2: They didn't flip the inequality

• Step 2: -10 divided by -5 is a negative 2

• No Errors

At what step did the student make an error?

• Step 1: They should have done 6 - 4 first

• Step 2: Combining 6 and -28 is -22

• Step 3: They should have subtracted the number from both sides

• Step 4: They should not have flipped the inequality

• No Errors

At what step did the student make an error?

• Step 1: -5k - 4k = 9k

• Step 1: -5k - 4k = -1k

• Step 2: -9 divided by -9 is -1

• Step 2: They should have flipped the inequality

• No Errors

At what step did the student make an error?

• Step 1

• Step 2

• Step 3

• Step 4

• No Errors

Solve for x

4x + 3 ≤ −6

• x ≥ −9

• x ≤ −9

• x ≥ −2.25

• x ≤ −2.25

Tags

CCSS.7.EE.B.4B

Which of the following is not a solution to this system of inequalities?

• (0,-1)

• (0,3)

• (4,0)

• (6,-2)

Tags

CCSS.HSA.REI.D.12

Find the mistake the person made when solving:

• They distributed -1(3+7x) incorrectly to -3-7x

• They canceled out -2x - 2x instead of getting -4x

• They subtract both sides by 2x

Tags

CCSS.8.EE.C.7A

m ≤ 15

• m ≤ 15

• m ≥ 15

• m ≤ 8

• m ≥ 8

Tags

CCSS.7.EE.B.4B

• f < 0.5

• f > 0.5

• f < 1.2

• f > 1.2

Solve for x

x + 8 > 11

• x > 3

• x < 3

• x > 19

• x < 19

Tags

CCSS.7.EE.B.4B