8
algebra

Which pair of lines intersects at a 90-degree angle?

A

y=5y = 5 and x=−2x = -2

B

y=5y = 5 and y=−2y = -2

C

y=xy = x and y=x+1y = x + 1

D

y=2xy = 2x and y=−2xy = -2x

Correct Answer: A

Choice A is the correct answer. Horizontal and Vertical.

  1. y=5y=5: Horizontal.
  2. x=−2x=-2: Vertical.
  3. Angle: 90 degrees (Perpendicular).

💡 Strategic Tip: H and V lines are always perpendicular.

Choice B is incorrect because parallel. Choice C is incorrect because parallel. Choice D is incorrect because slopes are not negative reciprocals (2×−2=−42 \times -2 = -4).

Next
Question 9 →
Back to Set
Linear Functions Set 94