1. Writing Linear Equations
Sec. 2.1
Writing Linear Equations

2. Point Slope Form
Equation of a line with slope m and a point on the line (x1, y1)
y – y1 = m (x – x1)
Use when give a point and the slope or 2 points.

3. Ex. 5
m = 3 and it passes through the point (1, -2)

4. EX
m = -1 point (10, -6)
m is undefined, point (-8, 1)

5. P. 178
Equations of Lines

6. Determining if lines are parallel, perpendicular, or neither
You must find and compare their slopes!!!
Parallel lines – same slope
Perpendicular lines – opposite reciprocals
Otherwise neither

7. 2) 1)

8. 3) L1: (0, 5) (4, 1)
L2: (-3, 2) (2, 7)
4) Write an equation for a line parallel to 3x + y = 4 and passing through the point (4, -2)
5) Write an equation for a line perpendicular to 3x + y = 4 and passing through point (4, -2)

9. Assignment
P , odd, 87 – 95 odd