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Question

Solve $2 y - x = 0; 10 x + 15 y = 105$

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Solution

$2 y - x = 0$ (1) , $10 x + 15 y = 105$ (2)
Multiplying equation (1) by 10 and adding equation (2)
$- 10 x + 20 y = 0$
$10 x + 15 y = 105$
________________
$35 y = 105$
$y = 3$
$2 y - x = 0$
$2 α 3 - x = 0$
$∴ x = 6$

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