1) {x+y=5 {y=5-x {y=5-x {y=5-x {y=5-x {y=5-1
{x-y=7 {x-y=7 {x-(5-x)=7 {2x=7-5 {2x=2 {x=1
Объяснение:
{y=4
=>
{x=1
2)x,y(0,4)
2)
{x+y=4
{3x+5y=20
x+y=4
x=4-y
3(4-y)+5y=20
12-3y+5y=20
2y=20-12
2y=8
y=4
x=4-4
x=0
x,y(0,4)
1) {x+y=5 {y=5-x {y=5-x {y=5-x {y=5-x {y=5-1
=> => => => =>{x-y=7 {x-y=7 {x-(5-x)=7 {2x=7-5 {2x=2 {x=1
Объяснение:
{y=4
=>
{x=1
2)x,y(0,4)
Объяснение:
2)
{x+y=4
{3x+5y=20
x+y=4
x=4-y
3(4-y)+5y=20
12-3y+5y=20
2y=20-12
2y=8
y=4
x=4-4
x=0
x,y(0,4)