Răspuns :

Beargalaxy2007id

4x-3y=20/×-5

5x+2y=2/*4

-20x+15y= -100

20x+8y=8

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/ 23y= -92/÷23

y= -4

5x+2y=2

5x+2(-4)=2

5x-8=2/+8

5x=10

x=2. S=(2, -4)

a)

x-2y= -1

92x-y=7

x= -1+2y

92x -y=7

x= -1+2y

92( -1+2y) -y =7

x=-1+2y

-92 + 184y -y =7

-92+183y=7/-93

183y=99

y=99/183

y=33/61

x= -1+2×33/61

x=5/61

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