F.4 - y=mx+b from Word Problems

The water level of a river is 34 feet and that it is receding (decreasing) at a rate of 0.5 foot per day.  Write an equation for the water level, L, after d days.

• L = 34 + 0.5d
• L = 34 - 0.5d
• L = 0.5 + 34d
• L = 0.5 - 34d

Tags

CCSS.HSF-BF.A.1A

Kynnley babysits and charges a flat fee of $3, plus $5 per hour.  Write an equation for the cost, C, after h hours of babysitting. 

• C = $5h + $3
• C = $3h + $5
• C = $8h
• C = $15h

Tags

CCSS.HSF-BF.A.1A

A plumber charges $25 for a service call plus $50 per hour of service.  Write an equation in slope-intercept form for the cost, C, after h hours of service.

• C = $75h
• C = $50 + $25h
• C = $50h - $25
• C = $25 + $50h

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

Brewster collected 100 pounds of aluminum cans to recycle.  He plans to collect an additional 25 pounds each week.  Write and graph the equation for the total pounds, P, of aluminum cans after w weeks. 

• P = 125w
• P = 100 + 25w
• P = 100w + 25
• P = 100 + 25

Tags

CCSS.HSF-BF.A.1A

A canoe rental service charges a $20 transportation fee and $30 dollars an hour to rent a canoe.  Write and graph an equation representing the cost, y, of renting a canoe for x hours. 

• y = $50x
• y = $20x + 30
• y = $30x + $20
• $30x + y = $20

Tags

CCSS.8.EE.B.5