Functions to Model Linear

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

A man is climbing down from 100 feet high descending 30 feet per minute. Which function models his descent?

• y = 100 - 30x

• y = 100 + 30x

• y = 100x + 30

• y = 100x - 30

Conner has $25,000 in his bank account. Every month he spends $1,500. He does not add money to the account.

Write a linear model that shows how much money will be in the account after x months.

• y=25000x-1500

• y=25000+1500

• y=1500x+25000

• y=-1500x+25000

Write an equation to represent the linear function: Mrs. Sauer has a rock collection. Mr. Sauer gave her 3 rocks to start. Mrs. Sauer adds 1 rock to her collection each week.

• y=x+3

• y=3x+1

• y=1/3x

Write an equation to represent the linear function: One day, Mrs. Fox tried to go skiing. She started at the top of a 400 foot hill and fell down at a rate of 20 feet per minute.

• y=20x+400

• y=-20x+400

• y=400x+20

• y=400x-20

What's the initial value of the equation y = 2x + 4

• 4

• -4

• 2

• 2x

What is the rate of change and initial value?

• Rate of Change = 3 Initial Value = 8

• Rate of Change = 8 Initial Value = 3

Is this graph a function or not a function? 

• Function

• Not a Function

What is the initial value?

• -3

• 0

• 3

• 20

Find the rate of change.

• -2 minutes per gallon

• -20 minutes per gallon

• -2 gallons per minute

• -20 gallons per minute