Question

{x - y = 5}
{x + y = 7}​

Answer 1

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{x - y = 5

{x + y = 7

{x - y = 5

{x = 7 - y

7 - y - y = 5

7 - 2y = 5

- 2y = 5 - 7

- 2y = - 2

y = 1

x = 7 - 1

x = 6

( x, y ) = ( 6, 1 )

{ 6 - 1 = 5

{ 6 + 1 = 7

{ 5 = 5

{ 6 + 1 = 7

{ 5 = 5

{ 7 = 7

( x, y ) = ( 6, 1 )

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