Solve :
$x + y = 4, 2 x + 5 y = 3$

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Solution

$x + y = 4 x = 4 - y 2 x + 5 y = 3 2 (4 - y) + 5 y = 3 8 - 2 y + 5 y = 3 3 y = - 5 y = \frac{- 5}{3} x = 4 + \frac{5}{3} x = \frac{17}{3}$

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