book Maths Puzzle Numerical Ability

Write the equation of the line that passes through point (5,-8) with a slope of -2.

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book Other Question

Solve and graph on a real number line:
2(3x-5)+ 7 > x + 12
Show that the points(5,7), (3,9) and (6,8) are the vertices of a right triangle.

can use distance formula or slope.