Question 1057714
Graph the feasible area,
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*[illustration lp14.JPG].
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Two vertices to check (0,40) and (40,0).
(0,40):{{{C=3x+5y=3(0)+5(40)=200}}}
(40,0):{{{C=3(40)+5(0)=120}}}
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{{{C[min]=120}}} at (40,0)