Odpowiedź :
x-y = 1
2x+y = 5
x = 1 + y
2(1 + y) + y = 5
x = 1 + y
2 + 3y = 5
x = 1 + y
3y = 3
y = 1
x = 1 + 1
x = 2
y = 1
2x+y = 5
x = 1 + y
2(1 + y) + y = 5
x = 1 + y
2 + 3y = 5
x = 1 + y
3y = 3
y = 1
x = 1 + 1
x = 2
y = 1
x - y = 1
2x + y = 5
z pierwszego obliczamy x = 1 + y
wstawiamy do drugiego
2(1 + y) + y = 5
2 + 2y +y = 5
3y = 5 - 2
3y = 3
y = 1
x - y = 1
x - 1 = 1
x = 1 + 1
x = 2
2x + y = 5
z pierwszego obliczamy x = 1 + y
wstawiamy do drugiego
2(1 + y) + y = 5
2 + 2y +y = 5
3y = 5 - 2
3y = 3
y = 1
x - y = 1
x - 1 = 1
x = 1 + 1
x = 2
x-y=1
2x+y=5
x=1+y
2+2y+y=5
x=1+y
2+3y=5
x=1+y
3y=3
x=1+y
y=1
x=1+1
y=1
x=2
y=1
2x+y=5
x=1+y
2+2y+y=5
x=1+y
2+3y=5
x=1+y
3y=3
x=1+y
y=1
x=1+1
y=1
x=2
y=1