book Maths Puzzle Numerical Ability

How do I find the points to graph:
y = -f(x)
.
y = f(x) + 3

Can you give me specific points to show on the graph.?

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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 I need help finding the answer for 3X=-2Y+13 and 2X+5Y=16 using elimination.
I don't know how to convert it so I can use elimination on the problem.