Select the pair of equations whose graphs are perpendicular.
a.) 5x - 8y = 9
12x - 5y = 7
b.) 3x + 6y = 8
y = 3x - 8
c.) y = 2x - 7
x + 3y = 3
d.) 2y = -3x + 5
2x - 3y = 4

What is the anwers for 9+2x=5x-3-x

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Last month, a 770 g box of cereal was sold at a grocery store for $3.10. however, this month, the cereal manufacturer launched the same cereal in a 640 g box, which is being sold at $2.50. what is the percent change in the unit price?