Question 935914
Plot the line,
{{{2x-8y=24}}}
{{{x-4y=12}}}
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{{{graph(300,300,-4,16,-10,10,(x-12)/4)}}}
Now choose a point not on the line.
(0,0) is convenient.
Test the inequality.
{{{2(0)-8(0)<=24}}}
{{{0-0<=24}}}
{{{0<=24}}}
True, so (0,0) is in the solution region. 
{{{graph(300,300,-4,16,-10,10,2x-8y<=24)}}}

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Now you can choose as many points as you need in the solution region.