(-12,-4) (4,8) what is the slope?

Ineed asap.i cant understand this question i need someone to me right away

You are making a battery for a science project. you have copper wire for your first electrode. you need to choose a conductor, a second electrode, and a device to plug into your battery. you have already chosen a lemon conductor. complete each statement below about the options that include a lemon conductor.

Which rule describes the composition of transformations that maps △abc to △a”b”c