1.ROZWIAŻ układy równań a) {x+3y=3 {x-y=5 b) {5y=2 {x+y=2 2/5

a) {x+3y=3 {x-y=5 x=3-3y 3-3y-y=5 x=3-3y -4y=5-3 x=3-3y -4y=2 / : [-4] x=3-3y y= 1/2 x=3-3 * 1/2 y= 1/2 x=3-1,5 y=1/2 x=1,5 y=1/2 b) {5y=2 / :5 {x+y=2 2/5 y= 2/5 x+2/5=2 2/5 y= 2/5 x=2 2/5 - 2/5 y=2/5 x=2 Miałam to ;). Na pewno dobrze ;]

a) {x + 3y = 3 {x - y = 5 | *3 {x + 3y = 3 {3x - 3y = 15 +______________ 4x =18 | :4 x = 4,5 4,5 + 3y = 3 3y = -1,5 {y = (-0,5) {x = 4,5 b) {5y = 2 |*(-1) {x + y = 2 |*5 {-5y = -2 {5x + 5y = 10 +____________ 5x = 8 |:5 x = 1,6 1,6 + y = 2 {y = 0,4 {x = 1,6