Matematyka metoda przeciwnych wspolczynnikow pomoze ktos?

Odpowiedź:
Szczegółowe wyjaśnienie:
3x + y = 4 / * (-5)
2x + 5y = 7
-15x - 5y = -20
2x + 5y = 7
-13x = -13 / : (-13)
x = 1
3 * 1 + y = 4
3 + y = 4
y = 1
3x + y = 1 / * 3
2x - 3y = -3
9x + 3y = 3
2x - 3y = -3
11x = 0 / : 11
x = 0
3 * 0 + y = 1
0 + y = 1
y = 1
4x - y = 5 / * (-3)
x - 3y = 4
-12x + 3y = -15
x - 3y = 4
-11x = -11 / : (-11)
x = 1
4 * 1 - y = 5
4 - y = 5
-y = 1 / : (-1)
y = -1
4x + 3y = 1
2x - y = 5/ * 3
4x + 3y = 1
6x - 3y = 15
10x = 16 / : 10
x = 16/10 = 8/5
4 * 8/5 + 3y = 1
32/5 + 3y = 1
7 + 3y = 1
3y = -6 / : 3
y = - 2