Rozwiąż układy równań metodą podstawiania: a)2x+3y=14 3x-2y=8 b)jedna druga x -2y=8 2x+5y=6 c)jedna druga x - trzy czwarte y=0 dwie trzecie x+jedna i jedna czwarta y=9 d)3x+4y=jedna i dwie trzecie 6x+3y=jedna i jedna czwarta

a)2x+3y=14 3x-2y=8 2x=14-3y/:2 3x-2y=8 x=7-3/2y 3(7-3/2y)-2y=8 x=7-3/2y 21-9/2y-2y=8 x=7-3/2y -4,5y-2y=8-21 x=7-3/2y -6,5y=-13/:-6,5 x=7-3/2y y=2 x=7-3/2*2 y=2 x=7-3 y=2 x=4 y=2 b)1/2x-2y=8 2x+5y=6 1/2x=8+2y/*2 2x+5y=6 x=16-4y 2(16-4y)+5y=6 x=16-4y 32-8y+5y=6 x=16-4y -3y=6-32 x=16-4y -3y=-26/:-3 x=16-4y y=8i2/3 x=16-4*26/3 y=8i2/3 x=16-104/3 y=8i2/3 x=16-34i2/3 y=8i2/3 x=-17i1/3 y=8i2/3 c)1/2x-3/4y=0 2/3x+1i1/4y=9 1/2x=3/4y/*2 1i1/4y=9-2/3x/*5/4 x=3/2y y=45/4-10/12x x=3/2y y=11i1/4-5/6*3/2y x=3/2y y=11i1/4-15/12y x=3/2y y+5/4y=11i1/4 x=3/2y 9/4y=45/4/*4/9 x=3/2y y=5 x=3/2*5 y=5 x=15/2 y=5 x=7,5 y=5 d)3x+4y=1i2/3 6x+3y=1i1/4 4y=5/2-3x/*1/4 6x+3y=5/4 y=5/8-3/4x 6x+3(5/8-3/4x)=5/4 y=5/8-3/4x 6x+15/8-9/4x=5/4 y=5/8-3/4x 6x-2,5x=10/8-15/8 y=5/8-3/4x 3i1/2x=-5/8/*2/7 y=5/8-3/4x x=-5/28 y=5/8-3/4*-5/28 x=-5/28 y=5/8+15/118 x=-5/28 y=0,625+0,127 x=-0,179 y=0,752