Question

Question 13 and 14 and 15

Answer 1

If you know the rules, you don't actually have to graph these to check if they're perpendicular, parallel, or neither.

parallel slopes are the same
perpendicular slopes are the opposite reciprocals
"neither" slopes fall into neither category

you should still follow directions and graph them if your teacher expects it, but with that knowledge:
13. y = 4x+7 and y = (-1/4)x-3
the slopes here, 4 and -1/4, are opposite reciprocals, so these lines are perpendicular

14. y = 3x-4 and y = 3x+1
the slopes here, 3 and 3, are the same, so these lines are parallel

15. y = x+5 and y = -5x-1
the slopes here, 1 and -5, have no relation in this case, so these lines are neither