8th grade Unit 3 Writing Functions

 Identify the slope and y intercept to write an equation of the line.

• y = -1/4x + 2
• y = 1/4x + 2
• y = -4x + 2
• y = 4x - 2

Using the information in the problem situation above, choose which equation(s) would best represent the problem. (you may need to choose more than one answer)

• y = 14x + 65

• 14x - y = -65

• y - 149 = 14(x - 6)

• y - 247 = 13(x - 14)

• y = -14x + 65

Bobby hires an electrician that charges a service call fee of $90 and a fee of $45 per hour. Which function could best be used to determine c, the total cost, of hiring an electrician?

• c = 90h + 45

• c = 45h + 90h

• c = 45h + 90

• c = (45+90)h

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Timmy hired a catering service to cater a wedding. The catering service charges a setup fee of $150 and charges $4 per meal served. If Timmy spent $310 dollars on catering, how many guests were served?

• 20 guests

• 40 guests

• 100 guests

• 50 guests

Tags

CCSS.7.EE.B.4A

Cesar wants to order a pizza for dinner tonight. A pizza at Pizza Patron costs $6 and an additional $0.75 for each topping. Which function could best represent the c, the cost, of a pizza with t, toppings? What is the price of a pizza with 4 toppings?

• c = 6t + .75t | cost = $8.00

• c = 6 + .75t | cost = $9.00

• c = 6t + .75 | cost = $8.00

• c = (6+75)t | cost = $9.00

Tags

CCSS.HSF-BF.A.1A

Richard sells sodas for $1.50 each. It cost Richard $10 to buy the sodas. Which function could best represent p, the profit, Richard made from selling sodas?

• p = 1.50s + 10

• p = 10s - 1.50

• p = 1.50 - 10s

• p = 1.50s - 10

Tags

CCSS.HSF-BF.A.1A

Verizon charges $0.60 for each text message sent and $0.25 for each minute. Which function can be used to determine the c, total cost, of the bill for t text messages and m minutes?

• c = 0.60t + 0.25m

• c = 0.60m + 0.25t

• c = (0.60+0.25)m

• c = 0.60t - 0.25m

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Riley sells leather boots for $80 each. Riley has to spend $200 to make the boots. Which equation can be used to find the p, profit, Riley makes from selling b, boots.

• p = 200 - 80b

• p = 200 - 80

• p = 80b - 200

• p = 200b - 80

Bob has $150 in his savings account and saves $40 per month.

• 150 + 40
• 40x + 150
• 150x + 40

The table shows Eli’s distance from home as he rides his bike at a steady rate after meeting a friend. . Write an equation in y = mx + b form that represents the miles, y, that Eli goes in x hours. 

• y = 2x + 2
• y = 12x + 12
• y = 12x + 2
• y = 2x + 12