exam Maths Puzzle Numerical Ability

Find the measure of an angle such that the sum of the measures of its complement and its supplement is 100 degrees.

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exam Other Question

graph each of the following inequalities on the cartesian plane
2x + y <_ -5

How do I know what number to plug in? Can I used any set of numbers? Do I have to make the statement true then graph it? value of the function g(x) = -5x + 2 when g(5x + 1)

Thanks Kevin