Question

solutia sistemului de doua ecuatii 2x-3y=5 si y-x=-2 este

Answer 1

prin metoda adunarii:
2x-3y=5
-x+y=-2|×3

2x-3y=5
-3x+3y=-6

y-x=-2
-x=-1

y-x=-2
x=1

x=1
y-1=-2

x=1
y=-2+1=-1

S={(1;-1)}