Parallel, Perpendicular, and Graphing Lines

Front

What is the y-intercept?

Back

The y-intercept is the point where a line crosses the y-axis.

Front

What does it mean if two lines are parallel?

Back

Two lines are parallel if they have the same slope and will never intersect.

Front

What does it mean if two lines are perpendicular?

Back

Two lines are perpendicular if the product of their slopes is -1.

Front

How do you find the slope of a line given two points?

Back

The slope (m) is calculated as m = (y2 - y1) / (x2 - x1).

Front

What is the slope of a horizontal line?

Back

The slope of a horizontal line is 0.

Front

What is the slope of a vertical line?

Back

The slope of a vertical line is undefined.

Front

What is the equation of a line in slope-intercept form?

Back

The equation of a line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.

Front

If the equation of a line is y = 2x + 3, what is the slope?

Back

The slope is 2.

Front

If two lines have slopes of 3 and -1/3, what can we say about them?

Back

The lines are perpendicular because the product of their slopes is -1.

Front

What is the y-intercept of the line y = -2x + 4?

Back

The y-intercept is 4.