Posted by dillon on Thursday, January 24, 2008 at 3:31pm.
I will do one problem and let you do the other.
c = 3d - 27
4d + 10c = 120
4d + 10(3d - 27) = 120
4d + 30d - 270 = 120
34d = 390
d = 11.47
c = 3d - 27
c = 34.41 - 27 = 7.41
Check
4d + 10c = 120
4(11.47) + 10(7.41) = 120
45 + 74.1 = 120 (close, probably not exact due to rounding error. Even so, this shows the process.)
I hope this helps. Thanks for asking.
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