Write an equation of the line in point-slope form, (y-y1=m(x-x1)) slope-intercept form (y=mx+b) and standard form (ax+by=c where a+b are not both zero) that passes through the given 2 points. (1,-2) and (1,-3) (-1,4) and (2,4)

Formula for slope is y2 - y1 over x2 - x1
Just from looking at the first set of points I know that the slope is 0 or undefined because the line is vertical. There is no y intercept. 
For the second one I know that it is a horizontal line meaning that there is no slope either. It does have a y intercept though.pointslopeform y = 4. Standardform y = 4

The probability of picking 2 green markers is 2/10