Answers

2014-10-20T18:00:55+08:00
X+Y=50
X=50-5
X=45

-2X+(-2Y) = -100
2X + 3.6  = 108
1.6Y = 8 *divide both sides by 1.6*
Y = 5

Checking:
X+Y=50
45+5=50
50=50

2X+3.6Y=108
2(45)+3.6(5)= 208
90+18=108
108=108

Final Answer: X=45 and Y=5
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2014-10-21T02:47:34+08:00
X +y=50  x=50-y   sub in  2x+3.6y=108 we get 2(50-y) +3.6y =108   ie100-2y+3.6y=108      1.6y=108-100=8 or y=8/1.6=5  x=50-5=45   then x=45 ,y=5
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