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In this mini-lesson, we introduce parallel and perpendicular lines as well as look at the relationship between their slopes. Parallel Lines are distinct lines lying in the same plane; they never intersect each other and have the same slope. Two lines Ax + By + C = 0 and Dx + Ey + F = 0 are parallel if A/D = B/E. For example, 2x + 4y = 5 and 2y + 4x = 6 are parallel lines. Perpendicular lines are lines that intersect at right angles. If two lines are perpendicular to each other, then the product of their slopes is equal to –1 i.e. the slopes are reciprocals of each other with opposite signs. For example, 3x + 4y = 12 and 4x – 3y = 20 are perpendicular lines.

In this mini-lesson, we introduce parallel and perpendicular lines as well as look at the relationship between their slopes. Parallel Lines are distinct lines lying in the same plane; they never intersect each other and have the same slope. Two lines Ax + By + C = 0 and Dx + Ey + F = 0 are parallel if A/D = B/E. For example, 2x + 4y = 5 and 2y + 4x = 6 are parallel lines. Perpendicular lines are lines that intersect at right angles. If two lines are perpendicular to each other, then the product of their slopes is equal to –1 i.e. the slopes are reciprocals of each other with opposite signs. For example, 3x + 4y = 12 and 4x – 3y = 20 are perpendicular lines.

This FREE mini-lesson is a part of Winpossible's online course that covers all topics within Algebra I. Click on the video below to go through it. If you like it, you can buy our online course in Algebra I by clicking here.

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model area formulas for parallelograms, trapezoids, and triangles by decomposing and rearranging parts of these shapes;

write equations that represent problems related to the area of rectangles, parallelograms, trapezoids, and triangles and volume of right rectangular prisms where dimensions are positive rational numbers; and