Pomozcie rozwiazac uklad rownan metoda podstawiania x+3y=7 2x+y=10

x + 3y = 7  stąd x = 7 - 3y 2x + y = 10 2(7 - 3y) + y = 10 14 - 6y + y = 10 - 5y = 10 - 14 - 5y = - 4 5y = 4 y = 4/5 x = 7 - 3y = 7 - 3 * 4/5 = 7 - 12/5 = 7 - 2 2/5 = 6 5/5 - 2 2/5 = 4 3/5 sprawdzenie 2 * 4 3/5 + 4/5 = 10 2 * 23/5 + 4/5 = 10 46/5 + 4/5 = 10 50/5 = 10 10 = 10 L = P