Carmy

If you're looking at the answer provided for the first question and are lost at how they jump from having two equations to having the final answers it's because they subtract the two equations. a+b=9 and 8a+b=51, 51-9=47, 8a-a=7a, and b-b is nothing. The...

If you are confused about how they jump from two equations to the answers, I'll simplify your studying in three words - Method of Elimination. You may remember it from solving linear problems in earlier years, anyway I'll explain it briefly as a refresher...