Ответы и объяснения

2013-04-25T10:12:29+04:00

x=7-y

(7-y)^2+(7-y)*y+y^2=43

49-14y+y^2+7y-y^2+y^2=43

y^2-7y+6=0

D=49-24=5^2

y1=(7-5)/2=1

x1=7-1=6

 

y2=(7+5)/2=6

x2=7-6=1