Are the given lines perpendicular?

y=6 , x=6

give a reason why or why not : ).
*will give brainliest*

Simplify a7/a4 a) 1/a3 b)-a/a2 c)a4/a3 d)a3

Fanny mendelssohn manages all the magazines and paperback books at a local grocery store. she prices many paperbacks to sell at $7.99. the cost to the store is $5.29. what is the markup rate on a paperback book, based on its cost?

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent and the median? 40 25 8 36 18 15 24 27 43 9 12 19 22 34 31 20 26 19 17 28