<PRE><B>Question 56627</B>
resolution:
let x = 1 bedroom and y = 2 bedroom
1) x + y = 80; 
2) 850x + 1050y = 78400

let solve equation 1 by y; y = 80 - x then plug in equation 2

850x + 1050(80 -x) = 78400
850x + 84000 - 1050x = 78400
-200x = 78400 - 84000
-200x = - 5600
 x = 28

now find y in equation #1: 28 + y = 80; y = 80 - 28; y = 52

one bedroom = 28; two bedroom = 52.


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