Answer:
C= 68
Step-by-step explanation:
We see that C grows bigger, as x and y grows bigger. So we want x to be as large as possible. But by the second constraint, x can at most be 5. So we choose
x=5
Now we use x=5 and the fourth constraint to find y
4*x-y [tex]\geq[/tex] 1
4*5-y [tex]\geq[/tex] 1
-y [tex]\geq[/tex] 1-4*5
y [tex]\leq[/tex] 19
Thus, y can at most be 19.
So for x=5, y=19,
C=6*5+2*19 = 30 + 38 = 68
