$$0.7x-0.5y=2.5$$
$x=\frac{5y+25}{7}$
$$0.7x=2.5+0.5y$$
$$0.7x=\frac{y+5}{2}$$
$$\frac{0.7x}{0.7}=\frac{y+5}{0.7\times 2}$$
$$x=\frac{y+5}{0.7\times 2}$$
$$x=\frac{5y+25}{7}$$
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$y=\frac{7x}{5}-5$
$$-0.5y=2.5-0.7x$$
$$-0.5y=-\frac{7x}{10}+2.5$$
$$\frac{-0.5y}{-0.5}=\frac{-\frac{7x}{10}+2.5}{-0.5}$$
$$y=\frac{-\frac{7x}{10}+2.5}{-0.5}$$
$$y=\frac{7x}{5}-5$$
