The value of c that makes the equations c+d=6 and c-2d=3 true is:

A) 1
B) 2
C) 3
D) 4
E) 5

The answer is 5, but I don't know why. Please explain?

3 answers

c+d=6 and c-2d=3

c = 6 - d

Substitute that value in the second equation.

6 - d - 2d = 3

-3d = - 3

d = 1
~~~~~~~~~~~~~~~~~~~~~~~~~

c + d = 6
c + 1 = 6
c = 5
Thank you! I'm studying for the College Board, so this really helped!
You're very welcome. Good luck with your exam! :-)
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