Given the graph of a line
As shown the line passes through the point (0, 0)
So, the relation has the form:

We will find the value of k using one point lying on the line
As shown the line passes through the point (4, 14)
So, when x = 4, y = 14
Substitute with x and y into the equation: y = k * x
so,

so, the answer will be option C) y = 3.5x