# Algebra 1 (Reiny or Kuai)

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1. Graph each equation. Tell whether the equation represents a function.

a. y = (x - 2)^2 - 1
b. x + y = 6
c. y = |x| -3
d. y = x^2 + 1

How am I supposed to graph these?

2. For each function, determine whether the given points are on the graph.

a. y = 7x - 2; (1, 5) and (2, 10)

• Algebra 1 (Reiny or Kuai)--Please, help me! -

Can anyone help me?

• Algebra 1 (Reiny or Kuai) -

make a table of values for each, plot the points and join them with smooth curves for the 1st and last.
The 1st and last are parabolas, the first has a vertex at (2,-1), the last one has a vertex at (0,1)
Both open up

the other two are linear , that is, straight lines, but
the y = |x| -3 lies all above the x-axis
I suggest graphing y = x , then reflecting the part which falls below the x-axis in the x-axis then moving the curve down by 3 units
see:
http://www.wolframalpha.com/input/?i=plot+y+%3D+%7Cx%7C+-+3

One of my favourite webpages, simply change the equation for the others.

• correction - Algebra 1 (Reiny or Kuai) -

The line
" the y = |x| - 3 lies all above the x-axis" is not correct,
should have said
"the y = |x| - 3 lies all above -3 "

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