Constant of Proportionality Writing Equations

You must know the constant of proportionality in order to write a proper equation like y=mx or y=kx.

• True

• False

Tags

CCSS.7.RP.A.2C

Anna rents a car for a day. The rental charge is $50 per day. Write an equation where r is the rental charge and d is the number of days she rents the car.

• r=50d

• d=50r

• r=50+d

• r=d-50

Tags

CCSS.6.EE.C.9

The number of candies sold can be determined where p is the price and c is the number of candies sold. If each piece of candy is $0.60, write an equation to represent this situation.

• p=c

• c=$0.60p

• p=$0.60c

• $0.60= pc

Tags

CCSS.6.EE.C.9

If 10 pairs of shoes cost $500, what equation could be used to represent the amount, a, in dollars that it cost to buy s, shoes?

• a= 50s

• a=500s

• s=500-10

• a=500+ 10 + s

Tags

CCSS.6.EE.C.9

The price to rent a car is proportional to the number of days. A family is planning to go on vacation and needs to rent a car. The car rental company's pricing is shown in the table. Which equation would they use to determine the price per day?

• y = 18x

• y = 18.50x

• y = 22.50x

• y = 22x

Tags

CCSS.7.RP.A.2B

Find the equation for the following situation: Joe pays $1,344 for cable for a year. There is a proportional relationship between the number of months, x, and the total cost, y.​ (a)  

• y=1344x

• y=12x

• y=112x+12

• y=112x

Tags

CCSS.7.RP.A.2C

Write an equation for the proportional relationship in the table.

• y=18x

• y=18.50x

• y=22.50x

• y=22x

Tags

CCSS.7.RP.A.2C

Write an equation for this relationship.

• y = 18x

• y = 18.50x

• y = 22.50x

• y = 22x

Tags

CCSS.5.OA.B.3

Write an equation that represents the relationship between the weight(x) and the cost(y).

• y = 1/2 x

• y = 1/4 x

• y = 2x

• y = 4x

Tags

CCSS.8.EE.B.5

Kelly can buy 2 pounds of grapes for $9. Write an equation to represent cost, c, for g, grapes.

• c=$4.50g

• $4.50-c

• g=$4.50c

• g + c =$4.50

Tags

CCSS.6.EE.C.9