Determine whether each situation represents a proportional relationship. If so, determine the constant. If there is no constant, type "none" x 1, 2, 3, 4, 5 Y -3, -6, -9, -12, -15 Proportional? Type yes or no.​

Which equation could represent the relationship shown in the scatter plot? y=−3x−2 y=−3/4x+10 y=−2/3x+1 y=9x−12 scatter plot with x axis labeled variable x and y axis labeled variable y. points go from upper left to lower right.