1. Warm-up: Find the measure of an interior and exterior angle of an 18-gon

2. 10/30 3.5 Lines in the Coordinate Plane

3. Learning Targets I can graph a line in a coordinate plane given the equation I can write the equation of a line given two points

5. Graph y = -2x + 9 Graph 6x + 3y = 12

7. Point Slope Form: y - y ₁ = m(x - x ₁ ) m is the slope and (x ₁, y ₁ ) is a point on the line.

8. How do you find slope of line through two points? (-4, 7) and (9, 2) (3, -5) and (1, 11)

9. Write an equation of the line through (-1, 4) with a slope of 3 Write an equation of the line through (-2, 3) AND (1, -1)

10. Write an equation of the line through (2, -4) with slope -1 Write an equation of the line though (5, 0) and (7, -3)

11. You need to be able to take an equation in point- slope form and rewrite it as slope intercept form EX: y – 8 = -3( x + 5)  point slope form y = -3x – 7  slope intercept form

12. Equations of Horizontal and Vertical Lines Horizontal lines y = y coordinate EX: y = 2 is a horizontal line at 2 Vertical lines x = x coordinate EX: x = 7 is a vertical line at 7

13. Graph x = 5 Graph y = -4 Write the equations of the horizontal and vertical lines through the point (3, 2)

14. No Homework, but be prepared to practice this further