Răspuns :
x+y=50
20+y=2*3x
6x-y=20
Fprmam un sistem :
x+y=50
6x-y=20
Acum prin metoda reducerii obtinem :
7x=70
x=10
10+y=50 => y=40
20+y=2*3x
6x-y=20
Fprmam un sistem :
x+y=50
6x-y=20
Acum prin metoda reducerii obtinem :
7x=70
x=10
10+y=50 => y=40
a + b = 50
2 * 3a = b + 20
6a - b = 20
a + b = 50, le adunam
7a = 70
a = 70 : 7
a = 10
b = 50 - 10
b = 40
2 * 3a = b + 20
6a - b = 20
a + b = 50, le adunam
7a = 70
a = 70 : 7
a = 10
b = 50 - 10
b = 40