exam Maths Puzzle Numerical Ability

How do you simplify this on page 274 problem 25?

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1. The inventor of a new product believes that the cost of producing the product is given by the function
C(x)= 1.75x + 7000

How much does it cost to produce 2000 units of her
Line l goes throught the point (5,–2) and is perpendicular to the line through (–2, 1) and (–4, –2). Find the equation (in slope-intercept form) for l.