sharin9889 sharin9889 12-09-2022 Mathematics contestada Reasoning Suppose lines l₁ and l₂ intersect at the origin. Also, l₁ has slope (y/x)(x>0, y>0) and l₂ has slope -x/y . Then l₁ contains (x, y) and l₂ contains (-y, x) . c. What must be true about a+b ? Why?