rozwiąż układ równań a) x - 3y = 5 | * (-4) 4x + 5y = 1 b) 3y = 6x + 12 7x = 5y y = ..... ....... = ........ prosze o pomoc!!!!!!!!

a) x - 3y = 5 | * (-4) 4x + 5y = 1 -4x - (-12y) = -20 4x + 5y = 1 17y=-19 /:17 y=-19/17 4x + 5y = 1 4x + (-19/17) = 1 4x = 1i19/17 /4 x = 1i19/17 na 4 y= -19/17 b) 3y = 6x + 12 7x = 5y 3y = 6x + 12 /*5 -5y = -7x /*3 15y = 30x + 60 -15y = -21x 0=9x+60 -60=9x /9 6,(6)=x 3y=6x+12 3y=6*6,(6)+12 3y=39,6+12 3y=51,6 /:3 y=17,2 x=6,6

a) x - 3y = 5 | * (-4) 4x + 5y = 1 -4x+12y=-20 4x+5y=1 17y=-19/:17 y=19/17 4x+5y=1 4x=109/19 /:4 x=109/76 b) 3y = 6x + 12 7x = 5y/:7 3y=6x+12 x=5/7 3y=84/7 /:3 y=4