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May 29, 2015

May 29, 2015

Posted by **wendy** on Tuesday, October 26, 2010 at 9:39pm.

- 8th grade -
**jai**, Tuesday, October 26, 2010 at 10:03pm(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,, :)

- 8th grade Math -
**Chelsea**, Monday, November 22, 2010 at 7:19pmHow 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.