Work Step by Step
$b = 2a+1$ $10a+b = 5b+2$ $10a+b = 5*(2a+1)+2$ $10a+b = 10a +5 + 2$ $10a+b = 10a+7$ $10a+b-10a= 10a+7-10a$ $b = 7$ $b = 2a+1$ $7 = 2a+1$ $7-1 = 2a+1-1$ $6 = 2a$ $6/2 = 2a/2$ $3 = a$
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