Question

rezolva sistemele de ecuatii in R ,folosind metoda mai rationala a) {x+y=12{x-y=-2 b) {2x+y=5{x-y=1

Answer 1

a) aplic metoda reducerii

x+y = 12

x-y = -2

------------ (+)

2x /  = 10 ⇒ x = 5

5+y = 12 ⇒ y = 7

b) aplic metoda reducerii

2x+y = 5

x-y = 1

-----------(+)

3x  /  = 6 ⇒ x = 2

2-y = 1 ⇒ y = 1

Answer 2

a)
x + y = 12
x - y = -2
_______
2x / = 10 => x = 5 => y = 7

b)
2x + y = 5
x - y = 1
________
3x / = 6 => x = 2 => y = 1