what is the slope of the line: y=-1/2x+3?

a. m=-1/2
b. m=3
c. m=2
d. m=-3


also,

Use the formulas for a cone:
r=3
l=4
LSA=?

a. 24π
b. 12π
c. 36π
d. 28π

I'm having a hard time figuring out the two. if you could please explain how I can solve this it would be great. thank you!