Geometrymedium · Past Paper
What is the angle between the lines y = x and y = -x?
A0 degrees
B45 degrees
C90 degrees
D180 degrees
✓ Correct Answer: C — 90 degrees
Slope of y=x is m1=1. Slope of y=-x is m2=-1. Since m1*m2 = -1, the lines are perpendicular (90 degrees).
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