MATH 141 Lecture 7: Math 1.7 Working with Functions: Getting Information from the Graph
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1. 7 working with functions: getting information from the graph. Intervals: a set of real numbers that correspond geometrically to a line segment. The open interval from a to b is all the numbers between a and b, excluding the endpoints a and b. (a,b) = {xia < x < b} The closed interval from a to b is all numbers between a and b, including the endpoints a and b. Examples: on the number line, graph all the numbers x that satisfy x > 3. Solve the inequality in interval notation: 2x + 5 > 99. *divide by 2 on both sides x > 99/2.
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