Question

continuando...........
[x+y=10
[2x-y=8

[x=2y
[3x+5y=55

Answer 1

x+y=10 -x2
2x-y=8

-2x-2y=-20
 2x+y= 8
3y=-12
y=12/3=4

x+4=10
x=10-4
x=6



x=2y
3x+5y=55

3x-2y=0 x-3
 3x+5y=55

-3x+2y=0
3x+5y=55

7y=55
y=55/7

3x+5.7,85=55
3x+39,25=55
3x=55-39,25
x=15,75/3
x=5,25

Answer 2

{x+y=10
{2x-y=8

x+y=10
x = 10-y

2x-y = 8
2(10-y)-y=8
20-2y-y=8
-3x = 8-20
-3y = - 12
y = 12/-3
y = 4

x+y = 10 
x+4 = 10
x = 10 - 4
x = 6

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{x=2y
{3x+5y=55

3x+5y=55
3.(2y)+5y=55
6y+5y=55
11y=55
y = 55/11
y = 5 

x= 2y
x = 2.11
x = 22                                        ok