Each week Manhattan GMAT posts a 700 level GMAT question on our blog and follows up with the answer the next day. Are you up for the challenge?
Two lines, k and m, intersect in the coordinate plane at point (a, b). The x-intercept of k and the y-intercept of m are both positive. Is ab positive?
(1) The x-intercept of m and the y-intercept of k are both negative.
(2) The slopes of k and m are both positive.