At what point does the line ax + y +b=0

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bhumika.k.shah: Legendary Member; Posts: 941; Joined: Sun Dec 27, 2009 12:28 amFollowed by: 1 member; Thanked: 20 times

by bhumika.k.shah » Sun Mar 28, 2010 9:04 am

At what point does the line ax + y + b = 0 intersect the y-axis?

(1) b = 5

(2) a = 3

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Source: Beat The GMAT — Data Sufficiency | Sun Mar 28, 2010 9:04 am

superdesi2100: Junior | Next Rank: 30 Posts; Posts: 11; Joined: Thu Dec 24, 2009 7:55 am; GMAT Score:740

by superdesi2100 » Sun Mar 28, 2010 9:21 am

ax+y+b=0
y=-ax-b

The point where the line intersects y axis, x=0 => y=-b is the point where the line intersects y axis.

a) b = 5 Sufficient.

b) a = 3 NOT sufficient.

Answer should be A.

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eaakbari: Master | Next Rank: 500 Posts; Posts: 435; Joined: Mon Mar 15, 2010 6:15 amFollowed by: 1 member; Thanked: 32 times

by eaakbari » Sun Mar 28, 2010 10:42 am

Since its intersecting with y axis, x = 0

y + b = 0

1 - sufficient

2 - insuff

Answer - A

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