Evaluate 3(a-4b) when a= -2 and b= 5
1 answer:
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Using the change in base property, we have 
approximately.
Rearranging the first equation gives:
Substituting this into the other equation gives:
If x=-1:
So x=-1, y=-5
Substituting this into the other equation gives:
If x=-1:
So x=-1, y=-5