Question 1204363
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The answer to  (b)  in the post by  @mananth is incorrect.


As it is written in his answer to  (b),  that system of equations  DOES  NOT  have solutions.




A correct answer to  (b)  (one of many others)  is   -6x+3y= 12.


Then the system really has many solutions.


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See the lesson

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=http://www.algebra.com/algebra/homework/coordinate/lessons/Geom-interpret-of-the-lin-system-of-two-eqns-with-two-unknowns.lesson>Geometric interpretation of the linear system of two equations in two unknowns</A> 

in this site.


Learn the subject from there.