Back to Practicemedium • Past Paper

Two lines a1x + b1y = c1 and a2x + b2y = c2 are parallel if:

Aa1/a2 = b1/b2 != c1/c2

Ba1/a2 != b1/b2

Ca1/a2 = b1/b2 = c1/c2

Da1a2 + b1b2 = 0