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Algebra: Themes, Tools, Concepts -- Teachers' Edition

What is the family name for the functions in problem 13? 15. &— Why do all the
foci of the functions in problem 13 lie on the same in-out line? Which in-out line is
it? Explain. 16. The foci for all functions in the family b = -3 also lie on one in-out
line. Which line? Explain how you know. Many m-families also have foci that lie
on the same in-out line in a function diagram. 17. a. On a function diagram, find
and mark the focus for y = -2.v + 3. b. On the same function diagram, find and
mark the ...