Posted by wendy on Tuesday, October 26, 2010 at 9:39pm.
(1) c = 3d - 27
(2) 4d + 10c = 120
there are several ways to solve this problem (system of linear equations),, but in this case, we substitution method since in equation (1), variable c is expressed in terms of the other variable d,, we then substitute c from equation (1) to equation (2):
4d + 10(3d-27) = 120
4d + 30d - 270 = 120
34d = 390
d = 195/17
*substituting this value of d to either equations (in this case, to (1)):
c = 3d - 27
c = 3(195/17) - 27
c = 585/17 - 27
c = (585 - 459)/17
c = 126/17
so there,, :)
How do you solve this problem? V = Bh
Solve each formula for the variable shown in RED. In this problem the variable in RED is the letter B.