I'm sorry to say that all of these are incorrect. You had to have changed both equations in each problem to slope-intercept formula (y=mx+b). You were trying to use substitution, but I recommend the elimination method since it's quicker. 1 is x= -5 and y= -8 (-5,-8). 9 is x= -2 and y=9 (-2,9). 11 is x=0 and y=7 (0,7).
