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If 7c -2b=15 and 3b-6c=2, what is the va...

If `7c -2b=15 and 3b-6c=2,` what is the value of `b +c` ?

A

`-27`

B

`-3`

C

8

D

17

Text Solution

Verified by Experts

The correct Answer is:
D
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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