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December 20, 2014

December 20, 2014

Posted by **Laura** on Wednesday, March 14, 2012 at 7:42pm.

- Math -
**Reiny**, Wednesday, March 14, 2012 at 8:38pmxy = 3.2

x+y = 3.6

from 2nd: y = 3.6-x

sub into 1st:

x(3.6-x) = 3.2

3.6x - x^2 - 3.2 = 0

x^2 - 3.6x + 3.2 = 0

x = (3.6 ± √.16)/2

= (3.6 ± .4)/2 = 1.88 or 2

if x = 2, then y = 1.6

if x = 1.88 , then y = 3.2/1.88 = 320/188 = 80/47

Since one of the numbers has to be a whole number, we reject the second case and the numbers are

2 and 1.6

check: 2(1.6) = 3.2 = 3 1/5

2 + 1.6 = 3.6 = 3 3/5

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