Writing Equations of Parallel and Perpendicular Lines

What is the point-slope formula used for writing equations of lines?

• y = mx + b

• x = my + b

• y - y1 = m(x - x1)

• ax + by = c

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

• They have the same slope.

• They have negative reciprocal slopes.

• They intersect at a right angle.

• They have different slopes.

Tags

CCSS.8.EE.B.6

What is the slope of the line parallel to x - y = 5?

• 1

• 0

• -1

• 5

Tags

CCSS.8.EE.B.5

What is the equation of the line that passes through (-5, -2) and is parallel to x - y = 5?

• y = x - 3

• y = x + 3

• y = -x - 3

• y = -x + 3

What is the slope of the line parallel to x + 5y = 10?

• 1

• -1/5

• 5

• -5

Tags

CCSS.8.EE.B.5

What is the equation of the line that passes through (-5, 7) and is parallel to x + 5y = 10?

• y = -1/5x - 6

• y = 1/5x + 6

• y = 1/5x - 6

• y = -1/5x + 6

What is the slope of the line perpendicular to x - 2y = 14?

• -1/2

• 1/2

• 2

• -2

Tags

CCSS.8.EE.B.5

What is the equation of the line that passes through (-1, -3) and is perpendicular to x - 2y = 14?

• y = 2x - 5

• y = -2x - 5

• y = 2x + 5

• y = -2x + 5

What is the slope of the line perpendicular to x - 2y = 6?

• 1/2

• -2

• -1/2

• 2

Tags

CCSS.8.EE.B.5

What is the equation of the line that passes through (-3, -1) and is perpendicular to x - 2y = 6?

• y = -2x - 7

• y = 2x - 7

• y = 2x + 7

• y = -2x + 7