Question 100854
Describe the graph of 3x+y<1
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Solve for y: y <-3x+1
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The boundary of the solution set is y=3x+1
{{{graph(400,300,-10,10,-10,10,-3x+1)}}}
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Take a test point that is not on the boundary, like (0,0)
Substitute the x and y values of the test point into the
inequality: 0 < 0 +1
This is false, so the half-plane solution set for the 
inequality is on the side of the boundary that does not
contain (0,0)-------------that would be the half-plane
above the boundary line.
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Note the boundary line is NOT part of the solution set because
equality is not stated in the original equation.
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The solution is "d".
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Cheers,
Stan H.