24-25 Alg1 3-6 FLASHCARD - Parallel & Perpendicular Lines

Front

What are parallel lines?

Back

Parallel lines are lines in a plane that never meet. They have the same slope.

Front

What are perpendicular lines?

Back

Perpendicular lines are lines that intersect at a right angle (90 degrees). Their slopes are opposite reciprocals.

Front

How do you find the slope of a line given two points (x1, y1) and (x2, y2)?

Back

Front

What is the slope-intercept form of a linear equation?

Back

Front

How do you write the equation of a line parallel to a given line?

Back

To write the equation of a line parallel to a given line, use the same slope as the given line and the point it passes through.

Front

How do you write the equation of a line perpendicular to a given line?

Back

To write the equation of a line perpendicular to a given line, use the negative reciprocal of the slope of the given line.

Front

What is the slope of the line given by the equation y = 3x + 2?

Back

The slope of the line is 3.

Front

If two lines have slopes m1 and m2, when are they parallel?

Back

Two lines are parallel if m1 = m2.

Front

If two lines have slopes m1 and m2, when are they perpendicular?

Back

Two lines are perpendicular if m1 * m2 = -1.

Front

Determine if the lines AB (A(2, -7), B(2, 3)) and CD (C(-4, 0), D(-4, -5)) are parallel, perpendicular, or neither.

Back

AB and CD are perpendicular.