Writing Equations from Real-Life Scenarios for Grade 8

A store sells pencils for $0.50 each. If you buy x pencils, write an equation to represent the total cost of the pencils.

• total cost = 0.50 / x

• total cost = 0.50 + x

• total cost = 0.50 * x

• total cost = x + 0.50

Maria has twice as many marbles as John. If John has y marbles, write an equation to express the number of marbles Maria has.

• M = 2y

• M = y/2

• M = y

• M = 3y

A car rental company charges a flat fee of $20 plus $0.15 per mile driven. Write an equation to represent the total cost C for driving m miles.

• C = 20 - 0.15m

• C = 20 + 0.10m

• C = 20 + 0.15m

• C = 15 + 0.15m

A gardener is planting flowers in rows. If there are r rows and each row has 5 flowers, write an equation to find the total number of flowers planted.

• total_flowers = r * 5

• total_flowers = 5 + r

• total_flowers = r - 5

• total_flowers = r / 5

A book costs $15. If you buy b books, write an equation to find the total cost T of the books.

• T = 15b

• T = 15b + 5

• T = 15 + b

• T = b + 15

A swimming pool is being filled with water at a rate of 10 gallons per minute. If it has already filled x gallons, write an equation to find the total gallons filled after t minutes.

• Total gallons = x + 10t

• Total gallons = x / 10 + t

• Total gallons = 10t - x

• Total gallons = x - 10t

A concert ticket costs $50. If you buy t tickets, write an equation to represent the total cost C of the tickets.

• C = 50 - t

• C = 50t

• C = 50 + t

• C = t/50

A recipe requires 2 cups of flour for every 3 cups of sugar. If you have s cups of sugar, write an equation to find the amount of flour needed f.

• f = s/3

• f = 3s/2

• f = (2/3)s

• f = (3/2)s

A train travels at a speed of 60 miles per hour. If it travels for t hours, write an equation to find the total distance d traveled by the train.

• d = t/60

• d = 60 + t

• d = 60t^2

• d = 60t

A factory produces 100 toys per hour. If it operates for h hours, write an equation to find the total number of toys produced.

• Total toys = h / 100

• Total toys = 100 - h

• Total toys = 100 + h

• Total toys = 100 * h