Rozwiąż układy równań metodą podstawiania. a) x + y = 3 x - 2y = 6 b) 2x - 3y = -5 -x + 5y = 12 c) 4x - 2y = 6 3x + 6y = 12 d) x - y = 5 3x + 4y = 8 e) 3x - 3y + 3 = 0 x + 1,5y - 2 = 0 f) 3x - 4y = 14 - 2x + 7y = - 18

a) x + y = 3 x - 2y = 6 x=3-y 3-y-2y=6 3-3y=6 -3y=6-3 -3y=3/(-3) y=-1 x=3-(-1) x=4 b) 2x - 3y = -5 -x + 5y = 12 -x=12-5y/*-1 x=-12+5y 2(-12+5y)=12 -24+10y=12 10y=12+24 10y=36/10 y=3,6 x=-12+18 x=6 c) 4x - 2y = 6 3x + 6y = 12 -2y=6-4x/-2 y=-3+2=5 3x=12-6y 3x=12-30 3x=-18 x=-6 d) x - y = 5 3x + 4y = 8 x=5+y 3(5+y)+4y=8 15+3y=8 3y=-7/3 y=-7/3=2,3 x=5+2,3=7,3 e) 3x - 3y + 3 = 0 x + 1,5y - 2 = 0 x=2-1,5y 3(2-1,5y)-3y=0 6-4,5y-3y=0 7,5y=-6/7,5 y=0,8 x=2-1,2 x=0,8 f) 3x - 4y = 14 - 2x + 7y = - 18 3x=14+4y/3 x=4,6-1,3y -2(4,6-1,3y)+7y=-18 -8+2,6y+7y=-18 9,6y=-18+8 9,6y=-10 y=-1,04 x=4,6+1,4 x=6 x=

a)x=3-y 3-y-2y=6-3 -3y=3(-3) y=-1 x=3-(-1)=4 b) c)4x-2y=6 x=4-2y 4(4-2y)-2y=6 x=4-2y 16-8y-2y=6 x=4-2y -10y=-10(-10) y=1 x=4-2*1 x=2 d)x=5+y 3(5+y)=8 x=5+y 15+3y+4y=8 7y=-77 y=-1 x=5=(-1)=4 e)3x-3y-3=03 x+1,5y-2=0 x=y-1 y-1+1,5y-2=0 2,5y=32,5 y=6 x=5 f)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=-136,5 y=-2 x=2