Find the Error Solving Equations

Find the Error
What error did the student make when solving the equation:
5x + 6 =  66
5x - 6 = 66 -6
5x = 60
5*5x= 60*5
x = 300

• The student subtracted 6 from both sides instead of adding

• Student multiplied by 5 instead of dividing by 5

• Student got the wrong answer when subtracting 66-6

• The student did not correctly eliminate the variable from one side of the equation

What is the first step in solving the equation 2a - 4(a - 5) = 10

• Add 4 to both sides

• Add the 2a and a 

• Distribute 4 to a and -5

• Distribute -4 to a and -5

Which step contains an error?

• Step 1

• Step 2

• Step 3

• No Error

Find the Error
What error did the student make when solving the equation:
1/5x + 6 = 3/5x + 5
1x + 6 = 3x + 5
-2x + 6 = 5
-2x = -1
x = 1/2

• The student found an incorrect common denominator

• The student did not multiply all terms by the common denominator

• The student did not use opposite operations appropriately

• The student did not correctly eliminate the variable from one side of the equation

Which step contains an error?

• Step 1

• Step 2

• Step 3

• No Error

Which step contains an error?

• Step 1

• Step 2

• Step 3

• No Error

Consider the problem

-4(6 - y) + 4 = -4

Identify the first step that is incorrect.

Which step contains an error?

• Step 1

• Step 2

• Step 3

• Step 4

• No Error

Which step is incorrect?

• Problem is correct

• step 1

• step 2

• step 3

Which step is incorrect?

• Step 1

• Step 2

• Step 3

• Problem is worked correctly