Alg 1: Parallel & Perpendicular Lines

Front

What is the slope of a line that is perpendicular to a line with slope -5?

Back

The slope of a line that is perpendicular to a line with slope -5 is 1/5.

Front

What do parallel lines have in common?

Back

Parallel lines have the same slope and different y-intercepts.

Front

What is the relationship between the slopes of perpendicular lines?

Back

The slopes of perpendicular lines are opposite reciprocals.

Front

Identify the slope of the line represented by the equation y = -rac{2}{3}x + 2.

Back

The slope of the line is -rac{2}{3}.

Front

Identify the slope of the line represented by the equation y = rac{2}{3}x + 9.

Back

The slope of the line is rac{2}{3}.

Front

Are the lines y = -rac{2}{3}x + 2 and y = rac{2}{3}x + 9 parallel, perpendicular, or neither?

Back

Neither.

Front

What is the equation of a vertical line?

Back

The equation of a vertical line is of the form x = a, where 'a' is a constant.

Front

What is the equation of a horizontal line?

Back

The equation of a horizontal line is of the form y = b, where 'b' is a constant.

Front

If two lines are perpendicular, what can be said about their slopes?

Back

If two lines are perpendicular, the product of their slopes is -1.

Front

What is the slope of the line represented by the equation 2x + y = -7?

Back

The slope of the line is -2.