Question 1088225
Cost function:C=4x+5y
Constraints:
2x-4y<=10
2x+y>=15
x>=0
y>=0
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*[illustration pl7.JPG].
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Two vertices:(0,15) and (7,1)
CHeck the value of the cost function and see which vertex minimizes the cost function. 
I'll do one, you do the other,
{{{C(0,15)=4(0)+5(15)=0+75=75}}}