Tuesday

July 22, 2014

July 22, 2014

Posted by **nick** on Saturday, October 22, 2011 at 2:17am.

- math -
**Jai**, Saturday, October 22, 2011 at 2:25amlet x = cost of bag

let y = cost of shoes

let 160 - (x+y) = cost of watch

set up equations:

(1) x = y + 15

(2) 160 - (x+y) = x - 20

solve simultaneously. we can either use elimination or substitution, but for this problem let's just use substitution. we substitute equation (1) to equation (2):

160 - (y + 15 + y) = y + 15 - 20

160 - 2y - 15 = y - 5

-2y - y = -160 + 15 - 5

-3y = -150

y = $ 50 (cost of shoes)

x = y + 15 = $ 65 (cost of bag)

160 - (x+y) = $ 45 (cost of watch)

hope this helps~ :)

**Related Questions**

math - Ryan reaches into his gym bag for a pair of running shoes. If there are ...

math 12 - Ryan reaches into his gym bag for a pair of running shoes. If there ...

Math - Mr. Logan purchased $390 in clothing (excluding sales tax). He bought 5 ...

alegebra - if i bought 4 pairs of shoes for $325.50 and later bought another ...

math - jeff bought 6 pairs of shoes and 4 jerseys for 560. Jersies cost 1/4 ...

Math - A shoe company will make a new type of running shoe. The fixed cost for ...

Calc BC - A shoe company will make a new type of running shoe. The fixed cost ...

Calc BC - A shoe company will make a new type of running shoe. The fixed cost ...

economics - # You produce shoes. Currently you produce 4 pairs of shoes at a ...

algebra - URGENT! How do you calculate for marginal cost against fixed cost. E.g...