Can someone do this quiz for me? it's on quiziz the code is 24801078

Inez has a phone card. the graph shows the number of minutes that remain on her phone card a certain number of days.

Simplify -4z+2y-y+-18z a.-22z+y b.-14z+2 c.3y+22z d.y +14z

Will give brainliest b. describe the function over each part of its domain. state whether it is constant, increasing, or decreasing, and state the slope over each part.