book Maths Puzzle Numerical Ability

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

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book Other Question

can you give me the formula to work out the hypotenuse when I only know 1 length & the three angles of the triangle Are these lines paralell, perpendicular or neither? -2X +Y=10 and 4X-Y=5. show all workings
thanks