Question

2x + y= 10
× + 2y= 5

Answer 1

{2x + y = 10

{x + 2y = 5 . (- 2)

{2x + y = 10

{- 2x - 4y = - 10

2x + y + (- 2x - 4y) = 10 + (- 10)

2x + y - 2x - 4y = 10 - 10

y - 4y = 0

- 3y = 0

y = 0/(- 3)

y = 0

x + 2y = 5

x + 2 . 0 = 5

x + 0 = 5

x = 5 - 0

x = 5

S = {(x , y) = (5 , 0)}

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