how do you write this as an equation?  An equation of the line that passes through the point (0,-1) and whose slope is 2?

⚑ Flag

slope = rise divided by run.  Rise is the change in y and run is change in x, So let y-(-1) = y + 1 = the rise The run is x-0 = x Now your slope is (y + 1) / x, but that = 2 (y+1) / x = 2 Multiply both sides by x y+1 = 2x y = 2x -1 Easier Method:  (0, -1) is the y intercept where x = 0. The slope intercept form of an linear equation is y = mx + b where m is the slope and b is the y intercept.  Thus: y = 2x - 1 is the correct answer from the slope intercept form.