y=mx+b Word Problems

Amy is on a weight loss show. When the show began, she weighed 231 pounds. During the show, she lost 4 pounds per week. Which equation represents the amount of weight she lost?

• y = 4 - 231x
• y = 231x - 4
• y = 231 - 4x 
• y = 4x + 231

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

For babysitting, Nicole 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
• H = 5c + 3
• H = 3c + 5

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

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 = 25 + 50h
• C = 50 + 25h
• H = 25 + 50c
• H = 50 + 25c

Tags

CCSS.8.F.B.4

CCSS.HSF.LE.A.2

The water level of a river is 34 feet. It is decreasing at a rate of 0.5 feet per day. What is the water level, w, after d days?

• w = -0.5d + 34
• w = 0.5d + 34
• w = 0.5d - 34
• w = -0.5d - 34

Tags

CCSS.6.EE.C.9