book Maths Puzzle Numerical Ability

True of false: A function f is decreasing on an open interval I, if for any choice of x1, and x2 in I, with x1 < x2, we have f(x1) > f(x2).

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book Other Question

Find the equation of the line which is perpendicular to the line and passing through the point (4, -2). Sketch the line and the perpendicular line in the same set of axes.
Whats the solution to this

6x squared-6=5x