Question

If 5c-2b=15 and 3b-4c=12, what is the value of b+c?

(a) -27
(b) -3
(c) 8
(d) 27
(e) cannot be determined with the information given

Answer 1

d).

using linear combinations you can add the 2 rows and it will get you b+c=27.

-2b+5c=15
3b-4c=12

b+c=27