Solve the simultaneous equations by substitution method.
$- x + 2 y = 0; 10 x + 15 y = 105$

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Solution

$- x + 2 y = 0$ ......................(1)
$10 x + 15 y = 105$ .............(2)
Multiplying (1) by 10 we get,
$- 10 x + 20 y = 0$ .........(3)
Adding (2) and (3) we get,
$y = 3$
Substituting $y = 3$ in (1) we get,
$x = 6$

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