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Functions - Math - 8

posted by on .

x: 2 | 4 | 6
y: 1 | 0 | -1

Please show me how to find the rule, thanks.
such as...
y= *equation*

  • Functions - Math - 8 - ,

    as x goes up by 2, y goes down by 1, so

    y = -1/2 x + c

    Now plug in a point: (2,1)

    1 = -1/2 (2) + c
    c = 2

    so, we have

    y = -1/2 x + 2

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