A pair of straight lines can be parallel lines or perpendicular lines or neither. Two lines are said to be parallel when their slopes are equal. Two parallel lines never intersect each other. On the other hand two lines are perpendicular when the product of their slopes is equal to 1. Two perpendicular lines intersect only once and at right angles. So when you are given two lines and asked to find if they are parallel or perpendicular lines, first compute the slope of the lines. Identify two points on a line to compute its slope. The slope of a line is the ratio of the difference of the y coordinates to the difference of the x coordinates. If the slope of the two lines is equal, then they are parallel lines. In case the product of the lines is equal to 1, they are perpendicular lines. This video shows how to identify parallel and perpendicular lines.
 Hot
 Latest

How To: Remember "greater than" & "less than" symbols

How To: Find the Percent Given Two Numbers

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Find a number given Its percent

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Calculate Faster Than a Calculator

How To: Calculate percent composition for chemistry

How To: Factor perfect square polynomials

How To: Find the area of a parallelogram using geometry

How To: Do long division without a calculator

How To: Convert between diameter and radius

How To: Find the slope of a line given 2 points with fractions

How To: Calculate the height and volume of a pyramid

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the area of a triangle when given 2 sides & angle

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Derive the area of a circle

How To: Normalize a data set into another scale

How To: Remember "greater than" & "less than" symbols

How To: Find the Percent Given Two Numbers

How To: Use ">" (greater than) and "<" (less than) symbols

How To: Find the Volume of Composite Figures (Also Called Composite Shapes)

How To: Find a number given Its percent

How To: Spend Money on a Graphing Calculator? Nah—Just Use This WebBased TI Emulator

How To: Calculate Faster Than a Calculator

How To: Calculate percent composition for chemistry

How To: Factor perfect square polynomials

How To: Find the area of a parallelogram using geometry

How To: Do long division without a calculator

How To: Convert between diameter and radius

How To: Find the slope of a line given 2 points with fractions

How To: Calculate the height and volume of a pyramid

How To: Find Leg Lengths and Hypotenuse of a 45 45 90 Triangle

How To: Convert Fahrenheit to Celsius with a formula

How To: Find the area of a triangle when given 2 sides & angle

How To: Find a slope of a straight line with: Ax + By + C = 0

How To: Derive the area of a circle

How To: Normalize a data set into another scale
Be the First to Comment
Share Your Thoughts