Question

@satellite73

Answer 1

Can I help?

Answer 2

line goes through the origin, so all you need is the slope
since \((1,6)\) is on the graph, as well as \((0,0)\) the slope is \(6\)

Answer 3

yes @Yttrium

Answer 4

if you know the two point form equation of a line.
\[y-y _{1} = \frac{ y _{2}-y _{?} }{ x _{2}-x _{1} }(x-x _{1})\]
if you know that form, you can easily form the equation by just pluggin in the values for (x1,y1) and (x2,y2). x and y are as is.