Question 198666
Here we go:
1.2x-3y=5 and 4x-6y=21  No intersection
{{{ graph( 300, 200, -10, 10, -10, 10, (2x-5)/3, (4x-21)/6) }}}


2.4x-6y=12 and x-5y=10  Int- (0,-2)
{{{ graph( 300, 200, -6, 5, -10, 10, (4x-12)/6, (x-10)/5) }}}


3.8x-4y=12 and -4x+2y=-6  {{{infinity}}} intersections
{{{ graph( 300, 200, -6, 5, -10, 10, 2x-3,2x-3) }}}


Anymore questions feel free to ask me.
Anthony Allie
arallie@gmail.com
http://arallie.webs.com/tutoring.htm