Finding Slope, Y-Intercepts, Writing Equations to Lines and Interpreting Graphs

The equation y = 3x + 8 models the amount of snow in inches(y) after x hours.

Interpret the y-intercept

• 8 inches of snow falls in 3 hours.

• 3 inches of snow falls in 8 hours.

• When we started measuring, there were already 8 inches of snow on the ground.

• Every hour, 3 new inches of snow accumulates.

James has to sell restaurant discount cards as part of a fund raiser for soccer. The equation y = -10x + 500 models his selling where y is the total number of cards and x is the number of days.

Interpret the slope.

• James is selling 500 cards over 10 days

• James earns $500 for every 10 cards he sells

• James is selling 10 cards each day

• James starts with 500 cards to sell.

The function for this graph is...

• y = -3x+1
• y=⅓ x + 1
• y= -⅓ x + 1
• y=3x-1

Which line has a negative slope?

• Yellow
• Red
• Blue
• Green

Which runner was faster?

• Runner A
• Runner B

Tickets to a baseball game cost $22 each and parking costs $10. What is the equation of the line that represents the cost of attending the game?

• y - 22 = 10x

• y = 22x + 10

• y = 22x - 10

• 22x + y = 10

Danny is opening a savings account with an initial deposit of $45. He saves $3 per day. Which graph shows the relationship between the number of days, x, and the total amount in his account, y.

• 
• 
• 

• Mariam

• Ahmed

Find the slope of the line.

• 1/2
• -1/2
• 2
• -2

What is the y-intercept of the line y = 4x - 10?

• 4
• -4
• 10
• -10