1. 5x = 4-2y 4x + y =3 5x = 4 - 2y y = - 4x + 3 5x = 4 - 2(4x + 3) 5x = 4 - 8x - 6 5x + 8x = -6 + 4 13x = 2/ 13 x = 2/13 tylko tyle bo teraz nie mam czasu;)
1. 5x = 4-2y 4x + y =3 5x+2y=4 4x+y=3 /(*-2) 5x+2y=4 -8x-2y=-6 -3x=-2 x=2/3 4*2/3+y=3 8/3 + y =3 y=3-8/3 y=-5/3 2. 6x - 3y = 9 x + 5y = - 9,5/(*-6) 6x - 3y = 9 -6x-30y=57 -33y=66/(-33) y=-2 6x-3*(-2)=9 6x=-6+9/6 x=15/6
1. 5x=4-2y 4x+y=3 5x=4-2y y=3-4x 5x=4-2(3-4x) y=3-4x 5x=4-6+8x y=3-4x 5x=-2+8x y=3-4x 5x-8x=-2 y=3-4x -3x=-2 /:(-3) y=3-4x x=⅔ y=3-4*⅔ x=⅔ y=3-8/3 x=⅔ y=⅓ 2. 2x-3y=9 x+5y=9,5 2x-3y=9 x=9,5-5y 2(9,5-5y)-3y=9 x=9,5-5y 19-10y-3y=9 x=9,5-5y 10y-3y=9-19 x=9,5-5y 7y=-10 /:7 x=9,5-5y y=-10/7 x=9,5-5(-10/7) y=-10/7 x=9,5+50/7 y=-10/7 x=... policz