Find q so that the lines y = (1 - 2q)x - 1 and (2 - q)y = x + 5 are perpendicular.

q = 1.

Step-by-step explanation:

y = (1 - 2q)x - 1

The slope of this line is 1 - 2q.

(2 - q)y = x + 5

y = x / (2 - q) + 5/(2 - q)

The slope of this line is 1/ (2 - q).

When lines are perpendicular  the slopes m1 and m2 have the relation

m1 .m2 = -1, so

(1 - 2q) * 1/ (2 - q) = -1

1 - 2q = -2 + q

-3q = -3

q = 1.

to determine the unit cost your would divide the total cost by the number sold.

7 bagels for $4.41       $4.41/7 = $.63 each at fresh side

5 bagels for $3.60         $3.60/5 = $.72 each at value mart