x + y = 5 => y = 5 - x
2x - y = 9
2x - (5 - x) = 9
2x - 5 + x = 9
2x + x = 9 + 5
3x = 14
x = 14/3
y = 5 - (14/3)
y = (15 - 14)/3
y = 1/3
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x + y = 5 => y = 5 - x
2x - y = 9
2x - (5 - x) = 9
2x - 5 + x = 9
2x + x = 9 + 5
3x = 14
x = 14/3
y = 5 - (14/3)
y = (15 - 14)/3
y = 1/3