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2x + 5y = 1
x = -5 + 3y
2 (-5 + 3y) + 5y = 1
x = -5 + 3y
-10 + 6y +5y = 1
x = -5 + 3y
-10 + 11y = 1 I +10
x = -5 + 3y
11y = 11 I /11
x = -5 + 3y
y = 1
x = -5 + 3*1
y = 1
x = -2
y = 1