algebra

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I have a couple questions I need help on.
Which model is most appropriate for the data set?
(-1,20),(0,10),(1,5),(2,20)

And

How many real-number solutions does the equation have?
-8x^2-8x-2=0
Thanks for the help

  • algebra -

    on the first sets, each increase in x results in y being increased by 5 (assuming you have a typo in the third set, and it should read (1,15). So linear.

    divide by 2
    1+4x+4x^2=0

    (1+2x)^2=0

    x= -1/2, -1/2 so one real solution.

  • algebra -

    Nope no typo on the third it is 20. Thanks Bob

  • algebra -

    Sorry it is 1,5

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