BDSunDevil wrote:
@Sudish
Could you please check the the attachment. I have different graph, with same answer, i. e. a and b can either be positive or negative.
Both the diagrams are correct. They are the two different cases that are possible. Let me explain.
The question is: "Is ab positive?"
ab will be positive when either both a and b are positive or both a and b are negative. Both a and b will be positive in the first quadrant and both a and b will be negative in the third quadrant. So if your lines intersect in the first or the third quadrant, ab will be positive.
Each statement alone tells you two things:
1. y intercept of m is positive and x intercept in negative i.e. slope of m is positive
2. y intercept of k is negative and x intercept is positive i.e. slope of k is positive
In this case, k and m cannot intersect in the second or fourth quadrant. They must intersect in the first of third quadrant as shown by the two diagrams you guys have put up.
Hence each statement alone is sufficient.
Answer (D).
y intercept of m is positive and x intercept in negative i.e. slope of m is positive ?
how the slope is coming positive.