Do Now Find the slope of the line passing through the given points. 1)( 3, – 2) and (4, 5) 2)(2, – 7) and (– 1, 4)

What is the slope of a horizontal line? The line doesn’t rise! All horizontal lines have a slope of 0.

What is the slope of a vertical line? The line doesn’t run! All vertical lines have an undefined slope.

Find the slope of the line passing through the two given points. 1)(-3,5) and (-3,1) 2)(4, 6) and (1,6)

The line passing through the points (2, 8) and (6, k) has a slope of. Find k.

The line passing through the points (5, – 8) and (3, a) has a slope of 4. Find a.

Slope – Intercept Form y = mx + b m represents the slope of the line b represents the y-intercept The y-intercept is the point where the line crosses the y-axis.

Write a slope-intercept equation of the line with the given slope and y-intercept. 1)m = 2, b = – 3 2)m = – 4, b = 5 3)m =, b = 0

4) Write the equation of a line that has a y-intercept of -3 and a slope of y = -3x – 4 2.y = -4x – 3 3.y = -3x y = -4x + 3

Find the slope and y-intercept for each line. 5)y = 4x – 1 6) y = – x + 3 7)y = 2x – 5

8) Find the slope and y-intercept of y = -2x m = 2; b = 4 2.m = 4; b = 2 3.m = -2; b = 4 4.m = 4; b = -2

Writing Equations From The Graph Use the graph to find the slope and y- intercept. 1)Use two points to find the slope. 2)Look where the line crosses the y-axis. 3)Substitute into y = mx + b

1) Write the equation of the line.

2) Write the equation of the line.