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Founder  Joined: 18 Apr 2015
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If the equation y = 3x - 18 were graphed on the coordinate a [#permalink]
Expert's post 00:00

Question Stats: 75% (00:38) correct 25% (02:24) wrong based on 4 sessions
Attachment: #GREpracticequestion the graph would cross the y-axis at the point .jpg [ 3.94 KiB | Viewed 337 times ]

If the equation $$y = 3x - 18$$ were graphed on the coordinate axes above, then the graph would cross the y-axis at the point (x, y) where

A. x = 0 and y = 18

B. x = 0 and y = -18

C. x = 0 and y = 6

D. x = 6 and y = 0

E. x = - 6 and y = 0
[Reveal] Spoiler: OA

_________________ GRE Instructor Joined: 10 Apr 2015
Posts: 1995
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Re: If the equation y = 3x - 18 were graphed on the coordinate a [#permalink]
1
KUDOS
Expert's post
Carcass wrote:
Attachment:
#GREpracticequestion the graph would cross the y-axis at the point .jpg

If the equation $$y = 3x - 18$$ were graphed on the coordinate axes above, then the graph would cross the y-axis at the point (x, y) where

A. x = 0 and y = 18

B. x = 0 and y = -18

C. x = 0 and y = 6

D. x = 6 and y = 0

E. x = - 6 and y = 0

KEY CONCEPT: The x-coordinate is 0 for all points on the y-axis.
So, we can automatically eliminate answer choices D and E, since they have x-coordinates that don't equal 0.

To determine the corresponding y-coordinate, we'll plug x = 0 into the equation for the line.
We get: y = 3(0) - 18 = 0 - 18 = -18

So, when x = 0, y = -18

Cheers,
Brent
_________________

Brent Hanneson – Creator of greenlighttestprep.com  Re: If the equation y = 3x - 18 were graphed on the coordinate a   [#permalink] 09 Jan 2019, 09:55
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