Algebraic approach:

Slope L1 = A

Slope L2 = B

Question: Is A>B?

L1: y1 = AX1 + b1

L2: y2 = BX2 + b2

1) y-intercept is when x = 0, thus

If b1 > b2, and given those two formulas above, we still know nothing about A & B.

NOT SUFFICIENT

2) Both lines go through point (5,9) and intercept at that point:

y1 = 9 = 5A + b1

y2 = 9 = 5B + b2

5A + b1 = 5B + b2

NOT SUFFICIENT

1,2) We know that:

b1 > b2

5A + b1 = 5B + b2

Hence, if b1 > b2 and then 5B has to be larger than 5A to compensate for the difference in b-values and maintain the equation equal.

We can conclude that A < B.

Answer: C

Hope it helps someone! Cheers!

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