Writing Equations

A farmer has b bags of potatoes. Each bag of potatoes weighs 50 pounds. Which equation can be used to find t, the total weight of the potatoes in pounds?

• t = 50b

• t = b + 50

• t = b - 50

• t = 50 - b

Which table shows values that represent the equation r = s + 10.6?

• F

• G

• H

• J

The graph shows the cost to rent a DVD from a kiosk.

Which list shows the dependent quantities in the graph?

• 5, 10, 15, 20, 25, 30, 35

• 3, 6, 9, 12, 15, 18, 21

• 1, 2, 3, 4, 5, 6, 7

• 2, 4, 6, 8, 10, 12, 14

Which statement describes the relationship between x and y in these two equations?

y = 5x

y = x + 5

• In y = 5x and y = x + 5, the value of y is 5 times the value of x.

• In y = 5x and y = x + 5, the value of y is 5

  more than the value of x.

• In y = 5x the value of y is 5 more than the

  value of x, and in y = x + 5 the value of y is

  5 times the value of x.

• In y = 5x the value of y is 5 times the value

  of x, and in y = x + 5 the value of y is 5 more than the value of x.

A small van has a capacity of 12 passengers. There are p people in the van. Which equation can be used to find e, the number of empty seats in the van?

• e = 12 + p

• e = 12p

• e = 12 – p

• e = p - 12

Rolando’s backpack weighs 2.5 pounds when it is empty. The total weight in pounds, y, of Rolando’s backpack when it contains x pounds of books is represented by the equation

y = x + 2.5. Which table best represents this situation?

• A

• B

• C

• D

The cost of a bookmark at Raven’s book fair is $0.68. Which equation can be used to find c, the cost in dollars of b bookmarks?

• c = 0.68 + b

• b = 0.68 + c

• b = 0.68c

• c = 0.68b

The table shows the relationship between d, the amount of money Elena has at the beginning of the day, and b, the amount of money she has after buying lunch.

Which equation represents the relationship in the table?

• b = d - 3.75

• d = 2b

• d = b +1.25

• b = d + 3.75

The graph shows the number of points y, a player earns in a video game based on the number of diamonds the player collects, x.

Which equation best represents the relationship between x and y?

• x = y + 75

• y = x + 75

• y = 75x

• x = 75y

Ms. Santiago asked her students to write a situation that could describe the relationship between all values of x and y in the table.

Which situation best describes the relationship between all the values of x and y in the table?

• Krystal has eight times as many green socks as blue.

• Latavia had eight dollars and then saved one dollar each week.

• Steven built one model in eight months and then built one model each week.

• Lauren practiced for eight hours the first week and for nine hours each week after that.