book Maths Puzzle Numerical Ability

I'm a distance learner and hope some one can help me.

I do not understand this question:

Find the equation of the in the graph (0,3).

I appreciate the help.

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book Other Question

Two travelers are 220 kilometers apart at noon and are headed toward each other along a straight road. They meet at 5:30 P.M., and one traveled 20 kilometers per hour faster than t Can someone help me solve this. Thank you in advance.
Use long division to reduce (6x^5 - 5x^4 - 6x^3 - 10x^2 + 21x - 9)/(2x - 3).