MATEMATYKA Z PLUSEM: Zadanie 4 str.93 Rozwiąż ukłądy równań: a){3x=12 {x-y=1 b){5y=2 {x=y=2⅖ c){4y-x=6 {17y=0 d){a=b {2a+b=9 e){u=4v {5u-v=10 f){3r=s {3r+s=24 prosze o szybka odpowiedz, dam najlepsza :)

a){3x=12 {x-y=1 3x = 13 |:3 x = 4 x - y = 1 4 - y = 1 y = 3 b){5y=2 {x=y=2⅖ 5y = 2 |:5 y = ⅖ x + y = 2⅖ x + ⅖ = 2⅖ x = 2⅖ - ⅖ x = 2 c){4y-x=6 {17y=0 17y = 0 |:17 y = 0 4y - x = 6 -x = 6 |*(-1) x = -6 d){a=b {2a+b=9 a - b = 0 2a + b = 9 3a = 9 |:3 a = 3 a - b = 0 3 - b = 0 b = 3 e){u=4v {5u-v=10 u - 4v = 0 |*(-5) 5u - v = 10 -5u + 4v = 0 5u - v = 10 3v = 10 |:3 v = 3⅓ 5u - v = 10 5u = 10 + v 5u = 10⅓ |:5 u = 10 ⅓ * ⅕ u = 31/3 * 1/5 = 31/15 = 2 1/15 u = 2 1/15 f){3r=s {3r+s=24 3r - s = 0 3r + s = 24 6r = 24 |:6 r = 4 3r - s = 0 3*4 - s = 0 -s = -12 |*(-1) s = 12