1. Writing Parallel and Perpendicular Lines Part 1

2. Parallel Lines // (symbol) All parallel lines have the same slope. Parallel lines will NEVER CROSS. Since Parallel lines don’t cross, we say they have NO solution. The slope of all vertical lines is undefined. (No Slope) The slope of all horizontal lines is zero.

3. Given slope : Parallel slope:

4. now go to next column 1) Find line parallel to and goes through (-6, 4) Step 1 Find m From given eq. Step 2 Find b Plug in x,y, & m Step 3 Find equation Plug in m & b

5. now go to next column 2) Find line parallel to and goes through (6, -2) Step 1 Find m— solve for y From given eq. Step 2 Find b Plug in x,y, & m Step 3 Find equation Plug in m & b

6. Perpendicular Lines (symbol) Lines that form a 90° Angle. Perpendicular Lines have one solution written as an ordered pair. Perpendicular Lines’ slopes are NOT the same (negative reciprocals). Do 2 things… FLIP the slope & CHANGE the SIGN

7. Given slope : Perpendicular slope:

8. now go to next column 3) Find line perpendicular to and goes through (-6, 4) Step 1Step 2Step 3 FLIP the slope & CHANGE the SIGN

9. now go to next column 4) Find line perpendicular to and goes through (4, 7) Step 1 Step 2 Step 3 FLIP the slope & CHANGE the SIGN