MAT_1143-feb_21 - February 21, 2011 Click to edit Master...

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Click to edit Master subtitle style February 21, 2011 Sections 3.1-3.2
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Exam 1 Return and go over exam 1 Exam 2 will be coming up rather quickly after we finish Chapter 4. I expect that will be Friday March 11 (2 1/2 weeks, 5 more lectures, away)
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Two Lines Up to this point, we’ve worked with only one line at a time Some applications involve us comparing two options-both of which are described using a linear function.
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Job 2, starts at $8.00 an hour Promised a raise of $.50 an hour each year employed So, salary after y years is A: S = 8 + 0.5*y B: S = 0.5 + 8.00*y C: S = 8 D: S = 0.5*y Which job is better?
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Depends on a number of factors How long you’d stay at the job Other factors besides pay But, we can look and compare the two equations: S = 6+1*y and S = 8 + 0.5*y Called a system of equations. Looking for an ordered pair (y, S) that SOLVES both
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MAT_1143-feb_21 - February 21, 2011 Click to edit Master...

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