book Maths Puzzle Numerical Ability

Write an equation of the line that passses through the given points.
(8,5), (11,14)

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book Other Question

The following is a non-linear system...solve it:

1/x + 2/y = 3
2/x + 1/y = 4
Driving down a mountain, Tom finds that he has descended 1800ft in elevation by the time he is 3.25 mi horizontally away from the top of the mountain. Find the slope of his descen