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January 31, 2015

January 31, 2015

Posted by **Carly** on Saturday, February 25, 2012 at 8:46pm.

1 1/2b+4w=18

b+w=7

Please help me and show your work thanks

- Math -
**Reiny**, Saturday, February 25, 2012 at 8:54pm1 1/2b+4w=18

(3/2)b + 4w = 18

times 2

3b + 8w = 36

equation #2 times 3

3b + 3w = 21

subtract them

5w = 15

w = 3

back into b+w=7

b+3=7

b=4

**w=3, b=4**

check::

1.5(4) + 4(3) = 18 , yeah

4+3=7, yeah

- Math -
**Damon**, Saturday, February 25, 2012 at 8:57pm1.5 b + 4 w = 18

b + w = 7 so w = (7-b)

1.5 b + 4 (7-b) = 18

1.5 b + 28 - 4 b = 18

10 = 2.5 b

b = 4

then

w = 3

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