Lesson: Graphing Lines

Comment on Graphing Lines

Pls help with the following

Pls help with the following question: https://gmatclub.com/forum/on-the-graph-above-when-x-1-2-y-2-and-when-x-1-y-136560.html (Question No. 8 from OG 2017) Is this why we say that a

Is this why we say that a straight line is made of an infinite number of dots? You bet! The same applies to

You bet! The same applies to the number line.

Cheers,
Brent

Hi Brent,

Hi Brent,
Grateful if you could provide me with your approach to solve this problem.
Thanks

In the xy-coordinate system, if (a, b) and (a+3, b+k) are two points on the line defined by the equation x = 3y - 7, then k =

A) 9
B) 3
C) 7/3
D) 1
E) 1/3 Here's my full solution: https://gmatclub.com/forum/in-the-xy-coordinate-system-if-a-b-and-a-3-b-...

Cheers,
Brent

Hi Brent,

Hi Brent,
Just checking for this question: I found it easier and faster to answer using this approach, is it sound?

Question:
In the xy-coordinate system, if (a, b) and (a+3, b+k) are two points on the line defined by the equation x = 3y - 7, then k =
_________
All i did was find the x intercept and substituted to get the why intercept.

So...
x= 3(0) -7
x=-7

(-7+3, 0+k)

-4=3y-7
y=1

(a+3,b+k)
(-7+3, 0+1)

therefore k=1

I think its a right approach that i hope to use in future, will it work or did I just get lucky? 