Real World Linear Functions

2x + 1 = 6

What would the first step be in solving this equation?

• Divide by 2

• Subtract 1

• Subtract 6

• Times 2

What step would you take to solve this equation?

• Multiply both sides of the equation by 2

• Divide both sides of the equation by 2

• Add 2 to both sides of the equation

• Subtract 2 from both sides of the equation

For a field trip 4 students rode in cars and the rest filled nine buses. How many students were in each bus if 472 students were on the trip?

• 4x=472

• 9x=472

• 4+9x=472

• 4+x=472

Find the y-intercept

• -3

• 3

• -1

• 1

Find the slope from the table.

• 0.25

• - 0.25

• - 4

• 4

Cell Phone Company initially charges $15.00 for airtime usage plus $0.20 per minute. Determine an equation that can be used to calculate monthly cell phone bill.

• y = 0.20x + 15

• y =15 (0.20x)

• y = 15 + x + 0.20

• y = 0.20 + 15x

A $30 startup fee is charged to join a team, as well as a $4 monthly fee. Write an equation in slope-intercept form that models this situation to determine how many months cost $58?

• 7 months

• 6 months

• 5 months

• 4 months

For lunch, Amanda had a hamburger and some potato chips. The hamburger totaled 325 calories and each chip had 12 calories. Write a liner equation to represent the situation.

• y = 12 + 325

• y = 12x  + 325

• y = 325 - 12x

• y = 325x + 12

Which of the following situations could be descried by the equation y= -25x + 120

• There are 120 people in the football stadium, and 25 more are entering each hour.

• A plumber charges $25 for a house call and $120 per hour.

• A teacher has 120 students. Her third period has 25 students

• There are 120 gallons of water in a tank. It releases water at a rate of 25 gallons per minute

Bob has $150 in his savings account and saves $40 per month. Which function models his savings?

• y = 150 + 40

• y = 40x + 150

• y = 150x + 40