Question

X+y=3
X-y=7
X+2y=4
2x+y=11

Answer 1

Răspuns:

Cred ca sunt doua sisteme:

Dacă e asa, atunci:

x=3-y

Inlocuim: 3-y-y=7 => -2y=4 => y = -2

x = 3 -(-2)

x=3+2

x=5

x=4-2×y

Inlocuim: 2×(4-2×y)+y=11

8-4×y+y=11

-3×y=11-8

-3×y=3 => y=-1

x=4-2×(-1)

x=4+2

x=6