Rozwiąż uklady równań metodą podstawiania. Klamra{3x-4y=14 {-2x+7y=-18 {4x-2y=6 {3x+6y=12 {3y+5x=0 {3x+2y=4 {7x-y+17=0 {5x+6y=8 {2x+5y=6 {3x-4y=2 {y-2x=6 {y=3=x Z góry dzięki

a) {3x-4y=14 {-2x+7y=-18|:(-2) 3x-4y=14 x=9+3,5y 3(9+3,5y)-4y=14 27+10,5y-4y=14 6,5y=-13 y=-2 x=9+3,5*(-2) x=9-7 x=2 b) {4x-2y=6 {3x+6y=12|:3 4x-2y=6 x=4-2y 4(4-2y)-2y=6 16-8y-2y=6 -10y=-10 y=1 x=4-2*1 x=4-2 x=2 c) {3y+5x=0 {3x+2y=4|:3 3y+5x=0 x=1⅓-⅔y 3y+5(1⅓-⅔y)=0 3y+6⅔-3⅓y=0 -⅓y=-6⅔ y=20 x=1⅓-⅔*20 x=1⅓-13⅓ x=-12 d) {7x-y+17=0 {5x+6y=8|:5 7x-y=-17 x=1,6-1,2y 7(1,6-1,2y)-y=-17 11,2-8,4y-y=8 -9,4y=-3,2 y=16/47 x=1,6-1,2*16/47 x=1,6-96/235 x=1⁹/₄₇ e) {2x+5y=6|:2 {3x-4y=2 x=3-2,5y 3(3-2,5y)-4y=2 9-7,5y-4y=2 -11,5y=-7 y=14/23 x=3-2,5*14/23 x=3-1¹²/₂₃ x=1¹¹/₂₃ f) {y-2x=6 {y+3=x y=6+2x 6+2x+3=x x=-9 y=6+2*(-9) y=6-18 y=-12