4.06 ACTIVITY - Inequalities II Error Analysis

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

Solve

9 > -2m + 2 - 3

• m < 5

• m > 5

• m < -5

• m > -5

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

Solve

28 < -4(-7x - 7) + 7x

• x > 0

• x < 0

• x > 0

• x < 0

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

Solve

-x < -x + 7(x - 2)

• x < 2

• x > 2

• x > -12

• x < -12

At what step did the student make an error?

• Step 1: -6 multiplied by -7 is +42

• Step 2: You should add 36 to both sides

• Step 3: The inequality should not be flipped

• No Errors

Solve

13 + 2v - 8 + 6 > -7 - v

• v > 6

• v < 6

• v > -6

• v < -6

At what step did the student make an error?

• Step 1

• Step 2

• Step 3

• Step 4

• No Errors

At what step did the student make an error?

• Step 1

• Step 2

• Step 3

• Step 4

• No Errors