Determine If Lines Are Parallel or Perpendicular From Their Slopes

Which equation is parallel to y = -9x - 1

• y = -9x +100

• y = 1/9x +9

• y = 1/9x -1

• y = -1/9x +2

Given the line y = 1/3 x + 7, find a perpendicular line to the given line that passes through point (5, 2)

• y = -3x -9

• y = 1/3x + 17

• y = -3x + 17

• y = -1/3x +7

Which equation is parallel to y = -10x + 21 and passes through the point ( -1, 9)

• y = -10x -1

• y = 1/20 x -1

• y = 10x + 21

• y = -10x + 1

What is the slope of a line that is parallel to the graph of 9x + 2y = 12?

• 9

• 9/2

• -9

• -9/2

Tags

CCSS.8.EE.B.5

If two lines are parallel, then their slopes are . . .

• the same

• opposite reciprocals

Tags

CCSS.8.EE.B.6

If two lines are perpendicular, then their slopes are . . .

• the same

• opposite reciprocals

Tags

CCSS.8.EE.B.6

• parallel

• perpendicular

• neither

• not enough information

If two lines are parallel their slopes are  ____________

• the same.

• negative reciprocals of each other.

Tags

CCSS.8.EE.B.6

Are these lines parallel?
y = 12x + 4
y = 12x +14

• YES

• NO

If two lines are perpendicular to each other their slopes are ____________

• the same.

• negative reciprocals of each other.

Tags

CCSS.8.EE.B.6