exam Maths Puzzle Numerical Ability

2/7+5/y

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help me someone please? i am so lost with this.

Construction. A garden area is 30 ft long and 20 ft wide. A path of uniform width is set around the edge. If the remaining garden area is 400ft^2, what is the width of the path?
What is the slope and y-intercept of the line represented by the equation

y = (3/8)x - 5?

slope = 3/8, y-intercept = 5

slope = 5, y-intercept = 3/8

slope = 3/8, y-intercept = -5

slope = -5, y-intercept = 3/8