Question 1071810
Four different questions?
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A:- 2x+4y=8 & x+2y=-4
B:- 2x+4y=8 & x+2y=4
C:- 2x+4y=8 & 2x+4y=6
D:- 2x+4y=8 & x+2y=8
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Assuming the first dash in each is not used as a negative sign,


Item D:
{{{system(2x+4y=8,x+2y=8)}}}


{{{system((1/2)(2x+4y)=(1/2)8,x+2y=8)}}}


{{{system(x+2y=4,x+2y=8)}}}


{{{system(y=-x/2+2,y=-x/2+4)}}}---------both slopes {{{-1/2}}} but different set of points, so parallel lines.  NO SOLUTION.



Item B:
System equivalent to the single equation {{{x+2y=4}}}.
Just the equation of a line.
Infinitely many solutions, all fit on the line.