Willian's line follows the law (where b = A constant representing the shape of t

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Question
Willian's line follows the law (where b = A constant representing the shape of the Willian's line, a = Another constant i.e. no load consumption per hour, I.P. = Indicated power, and m = Steam consumption per hour)
Options
A. I.P. = a x m + b
B. m = a + b x I.P.
C. I.P. = b x m + a
D. m = b/I.P. - a