Multi-Step Equations Error Analysis

Find the error

• There is no error

• They should have subtracted 3 to both sides

• They should have subtracted 2x to both sides

• They should have divided 7 to both sides

• The answer should be 6/7

5 + 2(n + 1) = 2n

Bill says the first step is the add 5 + 2 to get

7(n + 1) = 2n

• Bill is correct

• Bill is wrong. He should have subtracted 5 to both sides first.

• Bill wrong. He should have distributed the 2 first.

• Bill is wrong. He should have divided 2 to both sides first.

What is the error in the equation?

• Subtracting 1 from both sides, they should have added one

• Dividing by 6 on both sides, they should have divided 8 on both sides.

• 3(2x+1) equals 6x +1, it should = 6x + 3

What is the error in the equation?

• Adding 2x to 3x, they should have combined like terms.

• Subtracting 5 from both sides they should have added 5 to both sides

• Adding 2x to -2x, they should have subtracted it

• Dividing by 5 on both sides

What is the error in the final answer?

• Adding 5x to each side instead of 5

• Subtracting 7 from both sides

• Dividing -4 by 2 equals 2, it should equal -2

• Dividing both sides by 2, they should have divided both sides by -4

What is the error in the equation?

• Adding 1 to both sides, it should be subtracted from both sides.

• Distributing the negative sign when multiplying –3(x + 2), they should have got -3x -6

What is the error in the equation?

• Adding 5x to -3x equals 8x, it should equal 2x

• Adding 5x to -3x equals 8x, it should equal -8x

• Adding 5x to -3x equals 8x, it should equal -2x

What is the error in the equation?

• Subtracting 1 from both sides, they should have added.

• Dividing by 3 on both sides, they should have multiplied.

• Subtracting by 5 on each side, they should have added

• x = 20, x should equal -20

What is the error in the equation?

• Subtracting 6 from both sides

• Dividing by 2 on both sides

• 4 divided by 2 does not equal 2

• Subtracting x from one side, but not the other

What is the error in the equation?

• Dividing by 5 on both sides, they should have divided both sides by -2

• Combining 7x and -2x to equal 5x, it should equal -5x

• Subtracting by 6 on both sides, they should have subtracted 4 from both sides.

• Flipping the numerator and denominator for the value of x