Because this graph goes the=rough the origin, if we were to use y = mx + b, the value of b would be 0, so can be ignored.
Using y = mx, we just need to find the slope.
We have the points (2, 4) and (0, 0). Using the formula for slope, (4 - 0) / (2 - 0) = 4 / 2 = 2
The slope is 2, meaning the equation is y = 2x.
