book Maths Puzzle Numerical Ability

Explain why a vertical line,rather than a horizontal line,is used to determine if a graph represents a function

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book Other Question

How do you find the equation of a line from a few points?

Q: Find the equations of both lines.

The solutions of line m are (3,3), (5,5), (15,15), (34,34), (678,678), and (12
x^2+4x+4 over 8

divided by

(x+2)^3 over 16

How do you go about solving this problem. Any help is appreciated.