Which of the following are valid reasons for why the unit rate and slope of a proportional relationship are related to each other? Select all that apply. Multiple select question. cross out A) Both describe the rate at which the quantity y is increasing. cross out B) Both describe the change in x when y increases by 1. cross out C) Both values can be determined by examining the value of the y "-coordinate" when x = 1 on the graph. cross out D) Both describe the change in y when x increases by 1. cross out E) Both can be determined by the ratio xy form an ordered pair. cross out F) Both values can be determined by examining the value of the x "-coordinate" when y=1 on the graph.