Solving Equations Find the Error

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

Tags

CCSS.8.EE.C.7B

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

-15 = 5a +12- 2a + 6

• -11

• -3

• 10

• 7

Tags

CCSS.8.EE.C.7B

Which step contains an error?

• Step 1

• Step 2

• Step 3

• No Error

Tags

CCSS.HSA.REI.A.1

Which was the mistake the student made.

• The student did not combine like terms properly on the left side.

• The student did not combine like terms properly on the right side.

• The student divided by the wrong value.

• The student has x on the wrong side of the equal sign.

Tags

8.17

Which step contains an error?

• Step 1

• Step 2

• Step 3

• No Error

Tags

CCSS.HSA.REI.A.1

Which step contains an error?

• Step 1

• Step 2

• Step 3

• No Error

Tags

CCSS.HSA.REI.A.1

Which step contains an error?

• Step 1

• Step 2

• Step 3

• Step 4

• No Error

Tags

CCSS.HSA.REI.A.1

Consider the problem

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

Identify the first step that is incorrect.

Tags

CCSS.HSA.REI.A.1

What was the mistake the student make?

• The student did not distribute properly.

• The student did not combine like terms properly.

• The student did not subtract properly.

Tags

8.17