Question

7. Resolva o sistema
1/y + 1/x = 7/12
x . y = 12

Answer 1

1/y +1/x =7/12
fazer mmc entre x,y,12
12x + 12y =7xy>>>>>>>>>>xy=12
12x+12y=84
simplifique
x+y=7
x=7-y

xy=12
(7-y)y=12
distributiva
y^2-7y+12=0
baskara
y´=4
y´´=3

x=7-y
x´=3
x´´=4