-8x-8y=-64
-8y=8x-64
y=-x+8
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Log4 64=y 64=4y 26=22y Therefore y=3
If x=6 and y=8, then [ 5x + 8y ] = 5(6) + 8(8) = 30 + 64 = 94
8x - 7y = 7 (A)7x + 8y = 8 (B)7*(A): 56x - 49y = 498*(B): 56x + 64y = 648*(B)-7*(A): (64+49)*y = 64-49=> 113y = 15=> y = 15/113
It is: (81*9*64)+19 = 46,675
It depends on how y depends on x.