exam Maths Puzzle Numerical Ability

y=3x
x+2y=-21

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exam Other Question

The total profit (in dollars) for sales of x rowing machines is given by
P(x)=-0.2x^2+300x-200. What is the profit if 500 are sold? For what value of x will the profit be at a maximum? harrys motorboat can make an average of 8 miles per hour . one day he sets out for a trip , only to have the motor break down . harry rows back at two miles an hour. When he reaches his dock , he finds that he has been gone 5 hours . how far has he rowed?