Parallel & Perpendicular Lines

Front

Slopes of parallel lines are...

Back

identical

Front

What is the relationship between the slopes of perpendicular lines?

Back

Slopes of perpendicular lines are opposite reciprocals.

Front

What does 'b' represent in the equation y=mx+b?

Back

y-intercept

Front

If the slope of a line is -1/2, what is the slope of a line perpendicular to it?

Back

2 (the opposite reciprocal of -1/2 is 2).

Front

Given the equations y = -2/3x + 2 and y = 3/2x + 9, are these lines parallel, perpendicular, or neither?

Back

Perpendicular.

Front

What is the slope of a line that is parallel to the line y = 4x + 1?

Back

4 (the same slope as the original line).

Front

If two lines have slopes of 3 and -1/3, what can be said about their relationship?

Back

They are perpendicular (opposite reciprocals).

Front

What is the slope-intercept form of a line?

Back

y = mx + b, where m is the slope and b is the y-intercept.

Front

What is the slope of a line that is horizontal?

Back

0 (the slope of a horizontal line is always 0).

Front

What is the slope of a line that is vertical?

Back

Undefined (the slope of a vertical line is undefined).