Parallel and Perpendicular Equations

Front

Slopes of parallel lines are...

Back

the same

Front

Slopes of perpendicular lines are...

Back

opposite reciprocals

Front

What is the slope of a line in the equation y = mx + b?

Back

m (the coefficient of x)

Front

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

Back

m1 = m2

Front

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

Back

m1 * m2 = -1

Front

What is the slope of a horizontal line?

Back

0

Front

What is the slope of a vertical line?

Back

Undefined

Front

How do you find the slope between two points (x1, y1) and (x2, y2)?

Back

(y2 - y1) / (x2 - x1)

Front

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

Back

y = mx + b

Front

What does 'b' represent in the slope-intercept form?

Back

The y-intercept of the line