PLEASE HELP ME UNDERSTAND! I don’t know how to find. ML , CD, AC, UW (one explanation is ok too)

The lines shown below are parallel. if the green line has a slope of -1, what is the slope of the red line

State whether weight is a function of height for the six students and explain. a. yes, height is a function of weight because two students weigh 165 pounds but have different heights. b. no, height is not a function of weight because two students weigh 165 pounds but have different heights. c. yes, weight is a function of height because for each value of height there is one corresponding value of weight. d. no, weight is not a function of height because there is not enough data to determine a function.

If x + 10 = 70, what is x? a. 40 b. 50 c. 60 d. 70 e. 80