Slopes of parallel and perpendicular lines

Find the slope of a line parallel to y = 1/2x + 3

• 1/2

• 3

• -2

• 4

The lines formed by the equations

y = -4x + 5 and

y = 1/4x -5 are...

• parallel

• perpendicular

• horizontal

• vertical

What is true of the slopes of parallel lines?

• They are never equal

• They are the same

• They are opposite reciprocals

• They have opposite signs

Line A: y = 1/2x +2

Line B: y =-1/2x +7

Line C: y = 2x + 4

Line D: y = 1/2x + 3/4

Which lines are parallel?

• A and B

• B and C

• A and D

• C and D

Line A: y = -1/2x + 2

Line B: y = -1/2x +8

Line C: y = -2x + 4

Line D: y = 1/2x -9

Which lines are perpendicular?

• A and B

• B and C

• A and D

• C and D

What best describes the lines given by the equations?

y = -2x + 4

y = 2x + 4

• Parallel

• Intersecting

• Perpendicular

• Vertical

Which lines are parallel?

line j: y = 3/2x -4

Line k: y = 2/3x -4

Line l: y = 3/2x -10

line m: y = -3/2x -8

• J and L

• K and L

• J and M

• K and M

Which lines are perpendicular?

Line J: y = -4x + 8

Line K: y = 1/4x + 3

line l: y = 4x - 1/2

Line m: y = -1/4x -3/2

• L and M

• K and M

• J and M

• J and K

Find the slope of a line perpendicular to y = 3x + 7.

• -3

• 1/3

• -1/3

• 7

If two linear equations are said to have no common solution point, those lines must be...

• intersecting

• Perpendicular

• coinciding

• Parallel