Question

(x+1) • (y-3)=12
(2x+1) •︎ (y-1)=15
5 • x • (y=1)=60​

Answer 1

Răspuns:

Explicație pas cu pas:

(2x+1)(y-1)=15

2xy+y-2x-1=15

2(xy+x)+y-1=15

5x(y+1)=60

x(y+1)=12

xy+x=12

inlocuind mai sus avem

2*12+y-1=15

23+y=15

y=-8

(x+1)(-8-3)=12

-12(x+1)=12

x+1=-1

x=-2