Linear Regression & Word Problems

A plumber charges $50 to make a house call. He also charges $25 per hour for labor.

How much would it cost for 2.5 hours of labor?

• $100

• 4.50

• $112.50

• $65.00

• $123.45

A man is climbing down from 100 feet high descending 30 feet per minute.

• y = - 30x + 100

• y = 100 + 30x

• y = 100x + 30

• y = 100x - 30

Jenny went to the sale at Kohl's last weekend.  
T-shirts were on sale for $15 each and hoodies were on sale for $20 each.  If she spent $150 total, write an equation to represent this situation.  

• 20x + 15 = y 
• 35x = y 
• 15x + 20y = 150 
• 150 - 20x = 15y 

Write an linear equation to model the following: You want to buy desserts, ice-cream is $2.50 per scoop and puppychow is $4 per bag. You only have $20 to spend. 

If you buy 2 scoops of ice cream, up to how many bags of puppy chow can you buy?

• 2

• 4

• 3

• 3.5

The booster club made $708 on homecoming T-shirt sells. Small t-shirts cost $12 while large t-shirts cost $14. If x is small t-shirts and y is large t-shirts, what equation represents this.

• 12x + 14y = 708

• y-14 = 12(x-708)

• y=12x+708

• 12x + 708y = 14

In order to join a dancing club, there is a $30 startup fee and a $4 monthly fee. Write an equation in slope-intercept form that models this situation.  After how many months will the total cost be $58?

• 7 months
• 6 months
• 5 months 
• 4 months

Would you write a linear equation to model the following situation in slope-intercept form or standard form? 
Mrs. Harris is going to the movies. She spends $10 per ticket and $5 per bucket of popcorn. She only wants to spend $50. 

• Slope-intercept
• Standard form

Write an linear equation to model the following:
You want to buy desserts, ice-cream is $2.50 per scoop and puppychow is $4 per bag and you want to spend $20. 

• y=2.50x+4
• 2.50x+4y=20
• y=4x+2.5
• y=2.50/4x + 20

Sam ordered 4 tacos and 5 enchiladas for lunch at the restaurant. His bill came to $10.80. If each taco costs $1.20, how much does each enchilada cost?

• $1.00

• $1.20

• $0.85

• $1.10

Which line is the best line of best fit?

• a

• b

• c

• i don't see any lines