Algebra 1 (Reiny or Kuai)

1. Determine a relationship between x- and y-values. Write an equation.

{(1, -1), ( 2, -2), (3, -3), (4, -4)

A: x = -y?

2. How am I supposed to graph y = -x^2 - 7?

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1. 2. -x^2 -7

Open down
Move down -7 units

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posted by Kuai
http://www.jiskha.com/display.cgi?id=1383600600

y = -x or x+y=0

2. you should know what y = x^ looks like
reflect it in the x-axis to get y = -x^2
drop it 7 units to get your graph
or
make a table of values of about 8-10 points
e.g (0, -7) , (1, -8), (2, -11) etc
plot them and join with a smooth curve.
should look like this:
http://www.wolframalpha.com/input/?i=plot+y+%3D+-x%5E2+-+7

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posted by Reiny

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