Point on a line

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ashforgmat: Senior | Next Rank: 100 Posts; Posts: 71; Joined: Sun Feb 21, 2010 9:16 pm; Thanked: 3 times; GMAT Score:750

by ashforgmat » Thu May 13, 2010 9:52 pm

148) In xy plane, does the line y = 3x + 2 contain point (r, s)?
a. (3r + 2 -s)(4r + 9 - s) = 0
b. (4r - 6 - s)(3r + 2 - s) = 0

WHats the answer?

Source: Beat The GMAT — Data Sufficiency | Thu May 13, 2010 9:52 pm

pradeepkaushal9518: Legendary Member; Posts: 1309; Joined: Wed Mar 17, 2010 11:41 pm; Thanked: 33 times; Followed by:5 members

by pradeepkaushal9518 » Thu May 13, 2010 10:03 pm

imo D

y=3x+2 contain points means s=3r+2 or s-3r-2=0 or 3r+2-s=0

A and B both satisfy the condition hence D

ashforgmat: Senior | Next Rank: 100 Posts; Posts: 71; Joined: Sun Feb 21, 2010 9:16 pm; Thanked: 3 times; GMAT Score:750

by ashforgmat » Thu May 13, 2010 10:16 pm

thanks for replying ...even i think so....

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