Question

układy równań metoda podstawiania

7x-y +17=0

5x+6y=8

2x-5y=6

3x-4y=2

1/3x+2y=-1

x+y=2

y=3x-2

y=2x+3

Answer 1

7x-y +17=0

5x+6y=8

 

y=7x+17

5x+6(7x+17)=8

 

y=7x+17

5x + 42x + 102 = 8

 

y=7x+17

47x = -94 \:27

 

y=7x+17

x = -2

 

y=-14+17

x = -2

 

x=-2

y=3

 

2x-5y=6

3x-4y=2

 

2x=6+5y |:2

3x-4y=2

 

x = 3 +2,5y

3(3+2,5y) - 4y = 2

 

x = 3 +2,5y

9 + 7,5y - 4y = 2

 

x = 3 +2,5y

3,5y = -7 \:3,5

 

x = 3 - 5

y = -2

 

x=-2

y=-2

 

1/3x+2y=-1 \*3

x+y=2 

 

x + 6y = -3

x=2-y

 

2 - y +6y = -3

x = 2-y

 

5y=-5 /:5

x = 2-y

 

x = 3

y = -1

 

y=3x-2

y=2x+3

 

y = 3x - 2

3x-2 = 2x +3

 

y = 15 - 2

x = 5

 

x=5

y=13