( 10-8x-20=6y-13( 4y-63=20x-10y+2( 8x-6y=-3 | * (-10)( 20x+14y=65 | * 4(-80x+60y=30 ( -80x и 80x сокращаются)(80x+56y=260
116y=290 >>> 8x-(6*2,5)=-3 8x = 12
y=290\116 x=1,5 ответ: x=1,5;
y=2,5 >>> y=2,5.
10-4(2x+5)=6y-13
4y-63=5(4x-2y)+2
4y-63-20x+10y-2=0
14y-65-20x=0
x=0.7y-3.25
3-8x-6y=0
3-8*(0.7y-3.25)-6y=0
3-5.6y+26-6y=0
29-11.6y=0
y=29/11.6y=2.5
14*2.5-65-20x=0
-30-20x=0
x=-30/20
x=-1.5
( 10-8x-20=6y-13
( 4y-63=20x-10y+2
( 8x-6y=-3 | * (-10)
( 20x+14y=65 | * 4
(-80x+60y=30 ( -80x и 80x сокращаются)
(80x+56y=260
116y=290 >>> 8x-(6*2,5)=-3
8x = 12
y=290\116 x=1,5 ответ: x=1,5;
y=2,5 >>> y=2,5.
10-4(2x+5)=6y-13
4y-63=5(4x-2y)+2
4y-63=5(4x-2y)+2
4y-63-20x+10y-2=0
14y-65-20x=0
x=0.7y-3.25
10-4(2x+5)=6y-13
3-8x-6y=0
3-8*(0.7y-3.25)-6y=0
3-5.6y+26-6y=0
29-11.6y=0
y=29/11.6
y=2.5
14y-65-20x=0
14*2.5-65-20x=0
-30-20x=0
x=-30/20
x=-1.5