A farmer is plotting a grid over a section of farm land. There are 40 parallel rows of 10 plants with a perpendicular irrigation line every 5 plants. If the first plant is plotted at the point $(-10,2)$ and the second at $(-8,2)$ and so forth, which of the following equations could represent the path of the irrigation line ?

Question

$\begin{array}{1 1} (a)\; x=0 \\ (b)\; y=-6 \\ (c)\; y=-16 \\ (d)\; x=10 \end{array}$