Writing Equations of Lines from Graphs

What is the slope-intercept form of a linear equation?

• y = mx + b

• y = ax^2 + bx + c

• y = mx^2 + b

• y = m/x + b

How do you identify the y-intercept from a graph?

• The highest point on the graph

• Where the line crosses the x-axis

• The lowest point on the graph

• Where the line crosses the y-axis

What is the slope of a line that goes up 3 units and over 1 unit?

• 1

• 3

• 1/3

• 3/1

If a line crosses the y-axis at 4 and goes down 2 units and right 1 unit, what is the slope?

• 1/2

• -1/2

• 2

• -2

What is the equation of a line with a slope of 1/2 and a y-intercept of -3?

• y = 1/2x + 3

• y = -1/2x + 3

• y = 1/2x - 3

• y = -1/2x - 3

What is the y-intercept of the line representing the relationship between Celsius and Fahrenheit?

• 0

• 40

• 104

• 32

How do you calculate the slope between two points (104, 40) and (32, 0)?

• (104 - 32) / (40 - 0)

• (40 - 0) / (104 - 32)

• (32 - 104) / (0 - 40)

• (0 - 40) / (32 - 104)

What is the equation for converting Celsius to Fahrenheit?

• y = 5/9x - 32

• y = 9/5x - 32

• y = 9/5x + 32

• y = 5/9x + 32

If Amy starts with $25 and spends $5 each day, what is the slope of the line representing her bank account balance?

• -25

• 25

• -5

• 5

What is the equation of the line representing Amy's bank account balance?

• y = 5x + 25

• y = -5x + 25

• y = 25x - 5

• y = -25x + 5