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September 26, 2016 9/26 Parallel and Perpendicular Lines Review: Parallel Lines Perpendicular Lines m1 = m2 m1 = -1 m2 opposite reciprocal Example 1: Write the equation of a line that is parallel to y = -2x + 5, and goes through the point (9, -8) Step 1: Calculate slope. m = -2 Step 2: Use the given point and slope from Step 1 to plug into point slope form. y - y1 = m(x - x1) Step 3: Solve for y and write the equation in slope-intercept form. September 26, 2016 Example 2: Write the equation of a line that is perpendicular to 2x - 5y = 10, and goes through the point (5, 6) September 26, 2016