A young sumo wrestler decided to go on a diet yo go on a special high protein diet to gain weight rapidly. he started at 90 kilograms and gained weight at a constant rate. after 8 months, he weighed 138 kilograms

90 kilograms and gained weight at a constant rate. after 8 months, he weighed 138 kilogramsin equation formy = mx + b138 = m (8) + 90solve for m

m = (138 - 90) / 8m = 6 kg / month is the rate on which the young sumo wrestler gaining weight