aliagataylor aliagataylor

10-01-2017
Mathematics

contestada

let x=number of cds and y=number of dvds
use x+y=40 and 4x+6y=180 as your systemand solve each for y.

let xnumber of cds and ynumber of dvds use xy40 and 4x6y180 as your systemand solve each for y class=

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texaschic101 texaschic101

10-01-2017

x + y = 40.....multiply by -4
4x + 6y = 180
-------------------
-4x - 4y = -160 (result of multiplying by -4)
4x + 6y = 180
------------------add
2y = 20
y = 20/2
y = 10 <===

x = 30

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