# Pre calculus question !!!

Given two lines   L1：x + ay + b = 0   and   L2：x + cy + d = 0   as detailed below :

details:   1.  L1 and L2 cross each other in the section 1 of the Cartesian coordinate system.
2.  L1 crosses the positive section of X coordinate and crosses the negative section of Y coordinate.
3.  L2 crosses the positive section of the Y coordinate and the negative section of X coordinate.

How many among the real numbers a, b, c, d, a–c are positive ??

(a) 1    (b) 2    (c) 3    (d) 4    (e) 5

By:

Tutor
5.0 (397)

Math Teacher: 20 Yrs Teaching/Tutoring Calculus, PreCalc, Alg 2, Trig

Thank you so much ,, yess ,, the question actually have a graph , but the problem is that i couldn't draw it here . So I tried to describe it .
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09/28/18

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