SOLUTION: I forgot how to use substituition method this is the problem a=4b a-b=9

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Question 551108: I forgot how to use substituition method this is the problem a=4b
a-b=9
Answer by mathstutor458(57) About Me  (Show Source):
You can put this solution on YOUR website!
given a=4b , a-b=9
substitution method:-
substitute a=4b in a-b=9
4b-b=9
3b=9
b=9/3=3
a=4b=4*3=12
Therefore,a=12,b=3 ------------>answer