Question

How do you do #33? According to this book, the answer is A) 0. I have no idea how to get that answer.

Answer 1

`\bf 2a+3b=2b\implies 2a+3b-2b=0\implies 2a+1b=0 \\\\\\ 6a+3b\iff 3(2a+1b)\iff 6a+3b\qquad \begin{cases} 2a+1b=0\\ thus\\ 3(2a+1b)\\ 3(0)\iff 0 \end{cases}`