All we have to do is find the slope.
We can take any two points on the line. Let's take (2, 10) and (3, 15).
Plug them into the slope formula:
m = y2-y1/x2-x1
m = 15-10/3-2
m = 5/1
m = 5
Plug it into slope-intercept form:
y = mx + b
y = 5x + b
The y-intercept here is 0, because it passes through the y-axis at 0.
So we have:
y = 5x + 0
or
y = 5x