The equation of the line passing through point $ \left(0,~8.875\right) $, and point $ \left(21.372,~9.437\right) $ is:
$$ x-38.0285y+337.5027=0 $$To find equation of the line passing through points $ A(x_A,y_A) $ and $ B(x_B,y_B) $, we use formula:
$$ y - y_A~=~\frac{y_B - y_A}{x_B - x_A}(x-x_A) $$In this example we have:
$$ \begin{aligned} & \left(0,~8.875\right) \implies x_A = 0 ~~\text{and}~~ y_A = 8.875 \\[1 em] & \left(21.372,~9.437\right) \implies x_B = 21.372 ~~\text{and}~~ y_B = 9.437 \end{aligned} $$After substituting into the formula, we obtain:
$$ \begin{aligned} y - y_A~&=~\frac{y_B - y_A}{x_B - x_A}(x - x_A) \\[1 em] y - 8.875~&=~\frac{ 9.437 - 8.875 }{ 21.372 - 0 } \left( x - 0 \right) \\[1 em]y - 8.875 ~&=~ 0.0263 \left( x - 0 \right) \\[1 em]y - 8.875 ~&=~ 0.0263x + 0 \\[1 em]y ~&=~ 0.0263x + 8.875 \end{aligned} $$