Question

Tìm x, y € Z biết:

a.   xy+3x-7y=21

b.   xy+3x-2y=11

  Help me. My ☆☆☆ .Huhu...

Answer 1

a. xy+3x-7y=21

<=> xy+3x-7y-21=0
,
<=> x(y+3)-7(y+3)=0

<=> (y+3)(x-7)=0

=>y=-3

x=7

b. xy+3x-2y=11

xy+3x-2y-11=0

xy+3x-2y-6-5=0

x(y+3)-2(y+3)=5

(y+3)(x-2)=5

+)y+3=1 =>y=-2

x-2=5=>x=8

+) y+3=-1 => y=-4

x-2=-5 =>x=-3