Question

Solutia sistemului este : x+y=3
2x+3y=5

Answer 1

il poti rezolva prin doua metode
prima
x+y=3=> x=3-y
2x+3y=5

x=3-y
2(3-y)+3y=5

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

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

x=3-y
y=-1

x=3-(-1)
y=-1

x=3+1
y=-1

x=4
y=-1

a doua
  x+ y=3 /×(-2)
2x+3y=5

-2x-2y=-6
 2x+3y=5 (se aduna ecuatiile intre ele)
-2x+2x+(-2y)+3y=-6+5
-2y+3y=-1
y=-1

x+y=3
y=-1

x+(-1)=3
y=-1

x-1=3
y=-1

x=3+1
y=-1

x=4
y=-1