Verified answer

x + y = 20

5x - 3y = 4

x + y = 20

x = 20 - y

5x - 3y = 4

5(20 - y) - 3y = 4

100 - 5y - 3y = 4

100 - 4 = 5y + 3y

96 = 8y

96/8 = y

12 = y

x = 20 - y

x = 20 - 12

x = 8

Os números são 12 e 8

Zaucrástico falou que:

X~>menor

(20-x)~>maior

5x-3(20-x)=4

5x-60+3x=4

8x=64

x=8

(20-x)=12

x+y= 20

5x-3y= 4

x+y= 20 (*3)

3x+3y= 60

5x-3y= 4

8x= 64

x= 64/8

x= 8

5x-3y= 4

5*8-3y= 4

40-3y= 4

-3y= 4-40

y= 36/3

y= 12