charithaiddum wrote:
Please give us some extra detailed explained answer to this question.
Types of lines we can construct in xy-plane:A. Vertical lines
B. Horizontal lines
C. Lines with +ve slope and +ve y-intercept
D. Lines with +ve slope and -ve y-intercept
E. Lines with -ve slope and +ve y-intercept
F. Lines with -ve slope and -ve y-intercept
NOTE: I'm going to use A, B, C, D, E and F for the respective linesTotal lines =
35=A+B+C+D+E+FGiven:
C+D=15Now, C =
13(15)=5Thus,
D=15−5=10So,
35=0+B+5+10+E+FNow, 23 lines have a y-intercept less than or equal to zero i.e.
B+D+F=23Plugging
D=10 from above;
B+10+F=23B+F=13 Qs: Number of lines containing no point in the Quadrant IThis means all lines which have a -ve slope and -ve y-intercept i.e. Lines marked as
FSince,
B+F=13Even if we assume that all the lines which are marked as
B have y-intercept as
0 (in order to maximise
F), still we have
F (lines with -ve slope and -ve y-intercept) as
13 only
Col. A: 13
Col. B: 15
Col. A < Col. B
Hence, option B