Writing Equations

Select all equations that match this balanced hanger.

Select all equations that are represented in this diagram.

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Which equation is represented in this tape diagram?

• x+5=35

• 35x=5

• 5x=35

• 35-x=x

Select all equations that match this balanced hanger.

What is the variable in this expression? 3x=21

• 3

• x

• 21

What is the value of x in this tape diagram?

• 3x

• 9

• 3

• 1/3

A cell phone company charges $3.00 to make a phone call plus $0.15 for each minute for each minute you talk. Which equation would you use to determine the total cost, c, of a phone call that is m number of minutes long?

• c = 3.00 - 0.15m

• c = 0.15 + 3.00m

• 3.00 = c + 0.15

• c = 3.00 + 0.15m

Samuel bought 3 tires for $79.95 each and some rims for $59 each. He spent a total of $534.85. Which equation could be used to find the number of rims, r, Samuel bought?

• 3(79.95) - 59r = 534.85

• 79.95r - 59(3) = 534.85

• 3(79.95) + 59r = 534.85

• 79.95r + 59(3) = 534.85

What is the first step to solve this equation 2x + 11 = 23?

• Add 3 to both sides

• Subtract 11 from both sides

• Add 1 to both sides

• Divide 3 on both sides

Which equation matches the following situation? 331 students went on a field trip. Six buses were filled and 7 students traveled in cars. How many students were in each bus?

• n= # of students in each bus; 6n + 7 =331

• n=# of buses; 6n + 7 =331

• n= # of students in each bus; 6 + 7n =331

• n= # of students in each bus; 6n - 7 =331