a.) x = - y x - y = 6 x = -y -2y = 6 / :-2 x= 3 y = -3 b.) y = x + 3 2x + y = 9 y = x+3 3x +3=9 /-3 , :3 x=2 y = 2+ 3 =5 c.) x - 4y = 15 y = 4x y=4x x - 16x = 15 / :-15 x = -1 y= 4 * (-1) = -4 e.) -3x = 2y y = 1 - x y=1-x -3x=2 -2x/+2x y=1-x -x=2 /:-1 x=-2 y= 1- 2 = -1 f.) 5x + 6y = 8 x = 4y - 1 x=4y -1 20y -5 +6y =8 /+5 x=4y-1 26y = 13 /:26 y = 0,5 x= 2-1 = 1 pozdrawiam ;)
a) x= -y x-y=6 x= -y -y-y=6 x=-y -2y=6 /:(-2) y= -3 x= -(-3) y= -3 x=3 y= -3 b) y=x+3 2x+y=9 y=x+3 2x+x+3=9 y=x+3 3x=6 /:3 y=x+3 x=2 y=2+3 x=2 x=2 y=5 c) x-4y=15 y=4x x-4*4x=15 y=4x x-16x=15 y=4x -15x=15 /:(-15) y=4x x= -1 y= 4*(-1) x= -1 y= -4 e) -3x = 2y y = 1 - x -3x=2(1-x) y=1-x -3x=2-2x y=1-x -x=2 /:(-1) y=1-x x= -2 y=1-(-2) x= -2 y=3 f) 5x + 6y = 8 x = 4y - 1 5(4y-1) +6y=8 x=4y-1 20y-5+6y=8 x=4y-1 26y=13 /:26 x=4y-1 y= 1/2 x= 4* 1/2 -1 x=2-1 y= 1/2 x=1 y= 1/2
