Rozwiąż układy równań metodą odstawiania : {2x+3y=14 {3x-2y=8 {½x-2y=8 {2x+5y=6

A) 2x - 2y = 7 4x + 3y = 21 2x = 7 + 2y 4x + 3y = 21 2x = 7 + 2y 14 + 4y + 3y = 21 2x = 7 + 2y 7y = 7 / ÷ 7 2x = 7 + 2y y = 1 2x= 7 +2 y = 1 2x = 9 y = 1 x = 4,5 y = 1 C) 2x + 3y = 14 3x - 2y = 8 2x = 14 - 3y 14 - 3y + 7 - 1,5y - 2y = 8 2x = 14 - 3y -6,5y = -13 /÷ (-6,5) 2x = 14 - 3y y = 2 2x = 14 - 6 y = 2 2x = 8 / ÷ 2 y = 2 x = 4 y = 2 D) ½x - 2y = 8 2x + 5y = 6 ½x = 8 + 2y 32 + 8y + 5y = 6 ½x = 8 + 2y 13y = -26 / ÷ 13 ½x = 8 + 2y y = -2 ½x = 8 - 4 y = -2 ½x = 4 / ÷ ½ y = -2 x = 8 y = -2