Graphs Using Slope and Y-Intercept

How do you calculate slope using a graph?

• rise over run

• run over rise

• look at the y intercept

• look at the x intercept

Jackson started with $800 in his savings account, but has to pay $30 a month for his electricity bill. Write an equation that relates his savings, y, to the amount of months, x.

• y = -30x + 800

• y = 30x - 800

• y = -30x

• y = 12x - 30

What is the correct slope-intercept form?

• y = mx + b

• y = mb + x

• y = x

• y = -mx + b

Find the slope of the line that passes through (10, -8) and (1, 12).

• 20/9

• -20/9

• 4/9

• 9/4

Circle the equation of the line using slope-intercept form with a slope of -2 and y-intercept of -6.

• y = -2x - 6

• y = 2x + 6

Circle the equation of a line using slope-intercept form with a point of (-9, 3) and a slope of -2/3.

• are perpendicular.

• have the same y-intercepts.

The graph shows the line whose equation is

Circle the equation of the line in slope-intercept form using ordered pairs (-3, 8) and (3, 12).