Question

{ 2x+y=1

{ 5x-3y= -1

Answer 1

2x + y = 1

5x -3y = -1

 

6x + 3y = 3

5x - 3y = -1

-------------  dodaję stronami

11x = 2

x = 2/11

 

 

2x + y = 1

2 x 2/11 + y = 1

4/11 + y = 1

y = 1 - 4/11 = 7/11

 

 

odp. x = 2/11 a y = 7/11

 

 

 

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Answer 2

{ 2x+y=1

{ 5x-3y= -1

 

y=-2x+1

5x-3(-2x+1)=-1

 

y=-2x+1

5x+6x-3=-1

 

y=-2x+1

11x=2/:11

 

x=2/11

y=-4/11+1

 

x=2/11

y=-4/11+11/11

 

x=2/11

y=7/11