Question

{2×+y= 10
{×-y=2



{×+2y=11
{2×+3y=17
​

Answer 1

Resposta:

{2×+y= 10

{×-y=2

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3x=12

x=12/3

x=4

x-y=2

4-y=2

-y=2-4

-y=-2

y=2

{x+2y=11 .(-2)

{2x+3y=17

{-2x-4y=-22

{2x+3y=17

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-y=-5

y=5

x+2y=11

x+2.5=11

x+10=11

x=11-10

x=1