Question

rozwiązywanie metodą podstawiania a) 3x+y=3 2x+y=4 b)x-6y=3 3x+y=16 c) 2x-5y=-32 3x-2y=-15 prosze o odpowiedz

Answer 1

a)

{3x+y=3

{2x+y=4

{y=3-3x

{2x+3-3x=4

{y=3-3x

{x=-1

{y=3+3

{x=-1

{y=6

{x=-1

b)

{x-6y=3

{3x+y=16

{y=16-3x

{x-6(16-3x)=3

{y=16-3x

{x-96+18x=3

{y=16-3x

{19x=99

 

{y=16-3x

{x=99/19

 

{y=16-297/19

{x=99/19

 

{x=99/19

{y=7/19

 

 c)

{2x-5y=-32

{3x-2y=-15

{2x=5y-32

{3x-2y=-15

{x=5/2y-16

{3(5/2y-16)-2y=-15

{x=5/2y-16

{15/2y-48-2y=-15

{x=5/2y-16

{11/2y=33

 

{x=5/2y-16

{y=6

 

{x=-1

{y=6