Question

What is 2 lines that form a right angle at their point of intersection

Answer 1

Answer:

Perpendicular lines.

Step-by-step explanation:

They are called perpendicular lines.

If the slope of one line is m them the slope of the other is -1/m.

Answer 2

Answer:

Perpendicular lines

Step-by-step explanation:

Perpendicular lines when they intersect form right angles at their intersection.

The red line is perpendicular to the blue line in the picture because they form 90 degree angles at their intersection.