Writing a Function Rule

5 less than one fourth of x is y

• 5 <1/4 x = y

• 5 - x/4 = y

• x/4 - 5 = y

Tags

CCSS.6.EE.C.9

7 more than the quotient of a number n and 4 is 9

• n/4 + 7 = 9

• 7 + 4/n = 9

• 4n + 7 = 9

Tags

CCSS.6.EE.B.6

CCSS.6.EE.A.2

CCSS.6.EE.B.5

CCSS.6.EE.B.7

y is 9 more than half of x

• y = 9 + x/2

• y + 9 = 1/2x

• y = 2x + 9

Tags

CCSS.6.EE.C.9

1.5 more than the quotient of a and 4 is b

• 1.5 + a/b = 4

• 1.5 + 4/a = b

• a/4 + 1.5 = b

• 4a + 1.5 = b

Tags

CCSS.6.EE.C.9

The price (p) of an ice cream is $3.95 plus $0.85 for each topping (t) on the ice cream

• y = 0.85x + 3.95

• p = 3.95t + 0.85

• p = 0.85t + 3.95

Tags

CCSS.6.EE.C.9

A babysitter’s earnings e are a function of the number of hours n worked at a rate of $7.25 per hour

• y = 7.25x

• e = 7.25 + n

• e = 7.25n

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

A plumber’s fees f are $75 for a house call and $60 per hour h for each hour worked

• y = 75x + 60

• y = 60x + 75

• f = 75c + 60h

• f = 60h + 75

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

A hot dog d costs $1 more than one-half the cost of a hamburger h

• d = 1.5h

• d = 0.5h + 1

• d = h/(1/2) + 1

• d = 1h + 1/2

Tags

CCSS.6.EE.C.9

Eric is 2 years younger than 2 times his sister’s age. Write a rule that represents Eric’s age a as a function of his sister’s age s.

• a = 2 - 2s

• s = 2a + 2

• a = 2s - 2

• a = 2(s - 2)

Tags

CCSS.HSF-BF.A.1A

Eric is 2 years younger than 2 times his sister’s age. How old is Eric if his sister is 11?

Tags

CCSS.6.EE.B.6