If 7c -2b=15 and 3b-6c=2, what is the value of b +c ?
Answer»
`-27` `-3` 8 17
Solution :If you're not asked to find the value of an INDIVIDUAL variable, the question may lead itself to combination. This EQUATIONASKA for ` b + c,` so don't waste your time finding the VARIABLES individually if yu can avoid it. After rearranging the equations so that variables and constants are aligned, you an add the equations together : `-2b+7c =15` `(+ 3B -6c =2)/(b +c=17)`