Question

What is the equation of the line passing through `(2,8), (0,0)`?

Answer 1

`y=4x`

Explanation:

The points are obviously (I hope) those of a direct variation (assuming they lie on a straight line).

Characteristics of a direct variation:
[a]`color(white)("XXX")(0,0)` is a solution.
[b]`color(white)("XXX")`There is a value `c` such that `y=cx` for all points.