Question 255704
The first step in finding the equation is to determine the slope.  Remember that the slope of the line passing through (x1, y1) and (x2, y2) is:

{{{m = (y2 - y1)/(x2 - x1)}}}

So in our case we have:

{{{m = (3 - (-1))/(2 - 0) = 4/2 = 2}}}

So our slope is m=2.  Now, the equation for a line using the slope and one point is:

y - y1 = m(x - x1)

So using m=2 and (0, -1) we have

y - (-1) = 2(x - 0)

y + 1 = 2x

y = 2x-1