Question

-2x+6y=15
2x+2y=20
An nevoie de ajutor​

Answer 1

Răspuns:

x=45/8,y=35/8

Explicație pas cu pas:

-2x+6y=15

2x+2y=20

-2x=15-6y

2x+2y=20

x=(15-6y)/(-2)

2x+2y=20

2*(15-6y)/(-2)+2y=20

-15+6y+2y=20

8y=35

y=35/8

x=(15-35/8)/(-2)

x=-(120-35)/16

x=90/16

x=45/8