Step Equations Find Mistakes

Which step has the mistake?

• Step 1

• Step 2

• Step 3

• No mistakes

Which step has the mistake?

• Step 1

• Step 2

• Step 3

• Step 4

• No mistakes

Which step has the mistake?

• Step 1

• Step 2

• Step 3

• Step 4

• Step 5

Which step has the mistake?

• Step 1

• Step 2

• Step 3

• Step 4

• No mistake

Which step has the mistake?

• Step 1

• Step 2

• Step 3

• Step 4

• No mistake

Which step has the mistake?

• Step 1

• Step 2

• Step 3

• Step 4

• Step 5

A plumber fixed a leaky sink and charged $55 for parts and $45 per hour for labor.  The total bill was $190.  Which of the following equations can be used to find how many hours (x) the plumber spend fixing the sink?

• 55 + 45x = 190

• 45 + 55x = 190

• 55x + 45x = 190

• 55 + 45 = 190x

Hailey bought a book for $2.50 and 4 stickers.  She spent a total of 6.59.  How much did the stickers cost?

• $2.50 + 4s =$6.59

• $2.50s + 4 = $6.59

• $2.50 - 4s = $6.59

• 4s - $2.50 = $6.59

A teacher asks his students to solve the equation -7(z - 6) - 5 = -70 for z. Four students began the problem as shown below. Which two students have correct work shown?

Student 1: -7(z-6) = -65

Student 2: -7(z-6) = -75

Student 3: -7z + 42 -5 = -70

Student 4: -7z -6 = -70

• Student 1

• Student 2

• Student 3

• Student 4

What is the solution to the following equation?

Mathematical Equivalence

ON