Key Features of Linear Functions

The graph represents the money in a savings account.  What is the meaning of the y-intercept?

• The initial deposit was $30
• $30 is added to the account each week
• It took 30 weeks to same enough money to open an account
• not enough information

The graph represents gasoline consumption when driving a certain distance in km.  What is the meaning of the slope?

• The tank started with 50 L of gasoline
• the amount of gasoline consumed per km driven
• the distance it takes to lose a Liter of gas
• the gasoline is leaking because the slope is negative.

Janice is saving money for retirement. The equation y = 500x + 12,000 models her retirement savings where y is the total she has saved in dollars, and x is the number of months.

Interpret the y-intercept.

• Janice started with $500 in her account

• Janice started with $12,000 in her account

• Each month, Janice saves an additional $500

• Each month, Janice saves an additional $12,000

Find the slope

• 4/5
• 5/4
• -5/4
• -4/5

Find the slope of the line.

• 1/2
• -1/2
• 2
• -2

^{What is the x- intercept of the line?}

• (0,-1)
• (-2,0)
• (-1,0)
• (0,-2)

_{What is the y-intercept of the line?}

• (-1,0)
• (-1,-3)
• (1,1)
• (0-1)

How much does it cost to have your lawn mowed for 2 hours?

• $16
• $17
• $18
• $19

• Taylor can write 6 words per minute
• Taylor can write 25 words per minute
• Taylor can write 50 words per minute
• Taylor can write 150 words per minute

Which ordered pair could represent the y-intercept of a function.

• (0, 4)
• (4, 4)
• (4, 0)
• None of these.