1.

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 EQUATION ASKA 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)`


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