Last visit was: 03 Aug 2025, 18:08 It is currently 03 Aug 2025, 18:08

Close

GRE Prep Club Daily Prep

Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track
Your Progress

every week, we’ll send you an estimated GRE score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.

Close

Request Expert Reply

Confirm Cancel
Verbal Expert
Joined: 18 Apr 2015
Posts: 32910
Own Kudos [?]: 39259 [0]
Given Kudos: 26437
Send PM
Manager
Manager
Joined: 02 Sep 2024
Posts: 103
Own Kudos [?]: 37 [0]
Given Kudos: 44
Send PM
Verbal Expert
Joined: 18 Apr 2015
Posts: 32910
Own Kudos [?]: 39259 [0]
Given Kudos: 26437
Send PM
avatar
Intern
Intern
Joined: 06 Nov 2024
Posts: 4
Own Kudos [?]: 1 [0]
Given Kudos: 2
Send PM
Re: The equations of two straight lines are: L 6x + 4y + 5 = 0 and M [#permalink]
A and C are mutually exclusive, both alternatives cannot be correct
Intern
Intern
Joined: 21 Jul 2025
Posts: 4
Own Kudos [?]: 3 [1]
Given Kudos: 0
Send PM
Re: The equations of two straight lines are: L 6x + 4y + 5 = 0 and M [#permalink]
1
again only A & B is the answer
Verbal Expert
Joined: 18 Apr 2015
Posts: 32910
Own Kudos [?]: 39259 [0]
Given Kudos: 26437
Send PM
Re: The equations of two straight lines are: L 6x + 4y + 5 = 0 and M [#permalink]
Expert Reply
Let's analyze the two lines:
1. Line L: $\(6 x+4 y+5=0\)$
2. Line M: $\(9 x+6 y=0\)$

Step 1: Check if the two lines intersect
Lines intersect if they are not parallel.
- Slope of line L :

Rewrite $\(6 x+4 y+5=0\)$ as:

$$
\(4 y=-6 x-5 \Longrightarrow y=-\frac{6}{4} x-\frac{5}{4}=-\frac{3}{2} x-\frac{5}{4}\)
$$


Slope of $L$ is $\(-\frac{3}{2}\)$.
- Slope of line M :

Rewrite $\(9 x+6 y=0\)$ as:

$$
\(6 y=-9 x \Longrightarrow y=-\frac{9}{6} x=-\frac{3}{2} x\)
$$


Slope of M is also $\(-\frac{3}{2}\)$.
Since both lines have the same slope, the lines are parallel.
Are they coincident?
Check by comparing the constants:
The general form ratio of coefficients for coincidence should be equal:
For L: $\(6 x+4 y+5=0\)$

For M : $\(9 x+6 y+0=0\)$
Compute ratios $\(\frac{6}{9}=\frac{2}{3}, \frac{4}{6}=\frac{2}{3}\)$, but constant term ratio:

$$
\(\frac{5}{0} \quad(\text { undefined })\)
$$


So lines are parallel but not coincident.
Step 2: Check if the lines intersect
Since they are parallel and not coincident, they do not intersect.
Thus, Option A is true.
Step 3: Check if line $M$ passes through origin
Equation of M: $\(9 x+6 y=0\)$
If we put $x=0, y=0$, the equation holds:

$$
\(9(0)+6(0)=0\)
$$


So the line $M$ passes through the origin.
Thus, Option B is true.
Step 4: Check if $L$ and $M$ intersect in the third quadrant
Since the lines do not intersect at all, they cannot intersect in any quadrant.
Thus, Option C is false.
Final answer:
- A. True
- B. True
- C. False
Verbal Expert
Joined: 18 Apr 2015
Posts: 32910
Own Kudos [?]: 39259 [0]
Given Kudos: 26437
Send PM
Re: The equations of two straight lines are: L 6x + 4y + 5 = 0 and M [#permalink]
Expert Reply
Fixed the question because the source reported ALL three answer choices are true but indeed onloy A and B
Prep Club for GRE Bot
Re: The equations of two straight lines are: L 6x + 4y + 5 = 0 and M [#permalink]
Moderators:
GRE Instructor
121 posts
GRE Forum Moderator
37 posts
Moderator
1141 posts
GRE Instructor
234 posts
Moderator
29 posts

Powered by phpBB © phpBB Group | Emoji artwork provided by EmojiOne