Exam Maths Puzzle Co-ordinate geometry

A certain linear function is expresed in terms x and y. The graph of the function has a slope of 2/3 and a y-intercept of 3. What is the equation of this function?

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Exam Other Question

2x^2 - x - 15 =0
How do you find the root of this equation.
The charge for Yellow's Yard Service is a linear function of the number of hours the yard work takes. Len was charged $44 for three hours of yard work, while his neighbour Mavis was charged $60 for five hours of work. Write the cost C of having Yellow's work on a lawn as a function of the number of hours n it takes them to finish the work.