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d)

{5x-1=3y

{1,6y-2=4-2x

odp

x=1,4

y=2

e)

{-x-y=2

{2(3x+y)=-20

odp

x=-4

y=2

f)

{4x+3y=54

{1/3x=4(1+1/8y)

odp

x=13

y=2/3

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Odpowiedzi

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Najlepsza Odpowiedź!

d) \left \{ {{5x-1=3y} \atop {1,6y-2=4-2x}} \right \\ \left \{ {{5x-3y=1|*1,6} \atop {1,6y+2x=2+4|*3}} \right \\ \left \{ {{8x-4,8y=1,6} \atop {4,8y+6x=18}} \right \\ 14x=19,6|:14 \left \{ {{x=1,4} \atop {5*1,4-1=3y}} \right \\ \left \{ {{x=1,4} \atop {7-1=3y}} \right \\ \left \{ {{x=1,4} \atop {3y=6|:3}} \right \\ \left \{ {{x=1,4} \atop {y=2}} \right

 e)

{-x-y=2

{2(3x+y)=-20

 

{-x-y=2|*2

{6x+2y=-20

 

{-2x-2y=4

{6x+2y=-20

   4x= -16|:4

{x=-4

{6*(-4)+2y=-20

 

{x=-4

{-24+2y=-20

 

{x=-4

{y=2

 

f)

{4x+3y=54

{1/3x=4(1+1/8y)

 

{4x+3y=54

{1/3x-1/2y=4|*6

 

{4x+3y=54

{2x-3y=24

6x=78|:6

 

{x=13

{4*13+3y=54

 

{x=13

{54+2/3*3=54

 

{x=13

{y=2/3

 

:))

 


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