Lesson on Writing Linear Equations

What is the slope of the line shown on the graph?

• 1/2

• 2

• -1/2

• -2

What is the y-intercept of the line graphed below?

• 3
• 4
• -3
• 4/3

A plant is 5cm tall and growing at a rate of 3cm a month. Which equation represents this situation?

• y = 5 + 3

• y = 5x + 3

• y = 5 + 3x

• y = 8

Bob has $150 in his savings account and saves $40 per month. Which equation represents this situation?

• y = 150 + 40

• y = 40x + 150

• y = 150x + 40

• y = 40x

A holiday meal costs $12.50 a person plus a delivery fee of $30. Which equation represents this situation?

• y = 30 + 12.5x

• y = 12.5 + 30

• y = 12.5 + 30x

• y = 30x

Sonia has $40 in her lunch account and pays $2 each day to eat lunch. Which equation represents this situation?

• y = 40 + 2x

• y = 40 - 2x

• y = 2 + 40x

• y = 2 - 40x

Write an expression for the following. Jerry has $20 and makes $7 per hour. Which equation represents this situation?

• y = 7x + 20

• y = 7 + 20x

• y = 20 + 7

• y = 20x

A fitness club opens with 80 members. Each month the membership increases by 15 members. Which equation represents the relationship between the number of months the club has been opened, x, and the total fitness club membership, y?

• y=15x
• y=15x+80
• y=x+15
• y=80x+15

Easy Car Rental charges $8.50 an hour plus a rental fee of $25.50. Which equation represents this situation?

• y = 8.5 + 25.5

• y = 25.5 + 8.5x

• y = 8.5 + 25.5x

Sandra has a $20 itunes gift card and spends $3 each month. Which equation represents this situation?

• y = 3x + 20

• y = 3 + 20x

• y = -3x + 20

• y = -20x + 3