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Across 4. two line in a plane are ________ if they intersect to form a right angle. 7. the _____ ______ of a number x, written lxl, is the distance the number is from 0 on a number line. 8. the _____ of a nonvertical line is the ratio of the vertical change (the rise) to the horizontal change (the run). 9. a ______ is a mapping, or pairing, of input values with output values. 10. a ______ of an inequality in one variable is a value of the variable that makes the inequality true.

Down 1. the set of input values is the ______, and the set of output values is the range. 2. inequalities such as x < 1 and 2n - 3 > 9 are examples of _____ ______ in one variable. 3. the ______ of an inequality in one variable consists of all points on a real number line that corresponds to solution of the inequality. 5. two lines in a plane are ______ if they do not intersect and they have the same slope. 6. a relation is a _____ provided there is exactly one output for each input.