Geometrymedium · Past Paper
A line passes through (2, 2) and is perpendicular to y = x. Its equation is:
Ax + y = 4
Bx - y = 0
Cx + y = 0
Dy = 2
✓ Correct Answer: A — x + y = 4
Slope of y=x is 1. Perpendicular slope is -1. Equation: y - 2 = -1(x - 2) => y - 2 = -x + 2 => x + y = 4.
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