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Check whether the given system of equations is consistent or not. If consistent, solve graphically. $x - 2y = 0$
$2x + y = 0$
$2x + y = 0$
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$\frac{a_1}{a_2} = \frac{1}{2}$; $\frac{b_1}{b_2} = \frac{-2}{1} = -2$
$\frac{a_1}{a_2} \neq \frac{b_1}{b_2}$
$\therefore$ System of equation is consistent.
$\frac{a_1}{a_2} \neq \frac{b_1}{b_2}$
$\therefore$ System of equation is consistent.