exam Maths Puzzle Numerical Ability

3x+y=3

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A store wants to construct rectangular parking lot on land bordered on one side by a highway. It has 280 ft of fencing that is to be used to fence off the other three sides. What should be the dimensions of the lot if the enclosed area is to be a maximum? Find the standard form of the equation of the line with slope 1 and y-intercept 2