układ równań x+1kreska ułamkowa pod nią 2y+2=6 drugie równanie 3(2x-5)-4(3y+4)=5

drugie rownanie ; 3(2x-5)-4(3y+4)=5 6x-15-12y-16=5 6x-12y=5+16+15 -6xy=36|:(-6) xy=-6

(x+1)/( 2y+2)=6 /*( 2y+2) 3(2x-5)-4(3y+4)=5 (x+1)=6( 2y+2) 6x-15-12y-16=5 x+1=12y+12 6x-12y=5+31 x=12y+11 6(12y+11)-12y=36 x=12y+11 72y+66-12y=36 x=12y+11 60y=36-66 x=12y+11 60y=-30 x=12y+11 y=-1/2 x=12*(-1/2)+11 y=-1/2 x=-6+11 y=-1/2 x=5 y=-1/2

(x+1)/(2y+2)=6 /*(2y+2) 3(2x-5)-4(3y+4)=5 x+1=6(2y+2) 6x-15-12y-16=5 x+1=12y+12 6x-12y=36 x-12y=12-1 6x-12y=36 x-12y=11 /*(-1) 6x-12y=36 -x+12y=-11 6x-12y=36 5x=25 /:5 6x-12y=36 x=5 6*5-12y=36 x=5 30-12y=36 x=5 -12y=36-30 x=5 -12y=6 /:(-12) x=5 y=-1/2