Question

prosze o rozwiazanie dam naj, 1/ { x+2y=5 {3x-y=1 2/ (5+2)^2+(3a-5)(3a+5) To wszystko na dzisiaj bardzo prosze

Answer 1

1/

x = 5 - 2y

3 (5-2y) - y = 1

 

x = 5 - 2y

15 - 6y - y = 1

 

x = 5 - 2y

-7y = 1 - 15 | :(-7)

 

x = 5 - 2y

y = 2

 

x = 5 - 2*2

y = 2

 

x = 1

y = 2