Which is NOT true about a direct proportion? A. Its graph must be linear
B. Its graph must have a constant slope
C. Its graph must go through tbe origin
D. Its graph must have a slope of 0​

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.