Error Analysis 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: -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

• Astrid meets both of her expectations

• Astrid buys the expected number of fruits, but she does beyond her budget

• Astrid stays within her budget, but she doesn't buy the expected number of fruits

• Astrid doesn't meet either of her expectations

• Step 1

• Step 2

• Step 3

• Step 4

• Lars meets both of his expectations

• Lars works for the expected number of days but doesn't earn the expected number of money

• Lars earns the expected amount of money but doesn't work for the expected number of days

• Lars doesn't meet either of his expectations

Lars meets both of his expectations

• Lars meets both of his expectations

• Lars works for the expected number of days but doesn't earn the expected number of money

• Lars earns the expected amount of money but doesn't work for the expected number of days

• Lars doesn't meet either of his expectations

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

• (0,-1)

• (0,3)

• (4,0)

• (6,-2)