What is the slope of the line whose equation is 3x + 6y = 9

a. -3

b. -1/2

c. 1/2

d. 6

Can someone me out here and the tell me the greatest common factor

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?

What is the measure of angle x? answer