Odpowiedzi

2010-01-11T22:48:28+01:00
(4-x)2-x(x-3)+4y=-7
(y+1)2+y(5-y)-3x=1

16 - 8x + x² -x² + 3x +4y = -7
y² + 2y + 1 + 5y -y² - 3x = 1

-5x + 4y = -23 /*3
-3x + 7y = 0 /*(-5)

-15x + 12y = -69
15x -35y = 0
_______________+
-23y = -69 /:(-23)
-3x + 7y = 0

y = 3
-3x + 21 = 0

y = 3
-3x = -21 /:(-3)

y = 3
x = 7