(2 1/3; -2 3/7)
Объяснение:
3x+1=8; 3x=8-1; 3x=7; x=7/3; x=2 1/3
x-xy=8; x(1-y)=8; 3x(1-y)=24
7(1-y)=24
1-y=3 3/7
y=1 -3 3/7
y=-2 3/7
(2 1/3; -2 3/7)
Объяснение:
3x+1=8; 3x=8-1; 3x=7; x=7/3; x=2 1/3
x-xy=8; x(1-y)=8; 3x(1-y)=24
7(1-y)=24
1-y=3 3/7
y=1 -3 3/7
y=-2 3/7