Question

Sa se rezolve in z ecuația : 3xy-7x-7y== 5

Answer 1

Răspuns:

Explicație pas cu pas:

3xy-7x-7y= 5

x(3y-7)=7y+5

x=(7y+5)/(3y-7)∈Z

(3y-7)|(7y+5)

(3y-7)|21x+15

(3y-7)|(21x-49+64)

(3y-7)∈D64 Z=±{1;2;4;8;16;32;64}

3y-7=1......x∉Z

3y-7=2.....y=3 x=(7y+5)/(3y-7)=13

3y-7=4....

3y-7=8..........y=5  x=(7y+5)/(3y-7)=5

3y-7=16.

3y-7=32.........y=13  x=(7y+5)/(3y-7)=3

3y-7=64.........

3y-7=-1..y=2...x=(7y+5)/(3y-7)=19/(-1)=-19

3y-7=-2........

3y-7=-4.........y=1   x=(7y+5)/(3y-7)=-3

3y-7=-8

3y-7=-16....y=-3....x=(7y+5)/(3y-7)=1

3y-7=-32....

3y-7=-64...y=-57:3=-19.... x=(7y+5)/(3y-7)=-128/-64=2

grele RAUU si lungi!!!