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x - y = 2 ... ( 1 )
y = - x + 8 ... ( 2 )
Substitusikan ( 2 ) ke ( 1 )
x - ( - x + 8 ) = 2
2x - 8 = 2
2x = 2 + 8
2x = 10
x = 5
Substitusikan x = 5 ke ( 2 )
y = -( 5 ) + 8
y = - 5 + 8
y = 3
Maka, ( x = 5 dan y = 3 )