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6 (i) m = 4. equation of line is 3 9. ln 39. −. −. x. y. = 9 4. 39 19. −. −. ln = 4(3 ) + 3 x y. B1. M1. A1ft. forms equation of line. ft only on their gradient. (ii) x y = → = += 0.5 ln 4 3 3 9.928. y = 20 500. M1. A1. correct expression f