exam Maths Puzzle Numerical Ability

C - S
D = ----------- (for s) Depreciation
n

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how would I graph the line with a slope of 3 and passes through points (2,1) and (4,7). The $75 dollar cost for a party was to be shared equally by all those attending. Since 5 more people attended than was expected, the price per person dropped by 50 cents. How many people attended the party?