Math ~ Check Answers ~

Explain how to write a function rule from the table below. Then write a function rule.

X: 2 | 4| 6 |
And: 1 | 0 | -1 |

My Answer:

y = -1/2 x

But, -1/2 (2) = -1, and y(2) = 1, so we need to add 2 at the start. So,

y = 2 - 1/2 x

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  1. y = mx + b
    f(x) = 2m + b = 1
    f(x) = 4m + b = 0
    f(x) = 6m + b = -1

    -1(2m + b = 1)
    4m + b = 0

    -2m -b = -1
    4m + b = 0

    2m = -1
    m = -1/2
    2(-1/2) + b = 1
    -1 + b = 1
    -1+ 1 + b = 1 + 1
    b = 2
    y = mx +b
    y = -1/2x + 2

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  2. Help Is It Like This Which one the top or the bottom one!!! help check my answers

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  3. use the first pair of points (2,1) and (4,0)
    slope = -1/2

    so y = mx + b ----> y = -(1/2)x + b
    sub in (4,0)
    0 = (-1/2)(4) + b
    b = 2

    y = (-1/2)x + 2

    use our non-used point to check:
    does (6,-1) lie on it?

    LS = -1
    RS = (-1/2)(6) + 2
    = -3+2
    = -1

    your answer is good.

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  4. Thanks

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  5. X | 0 | 1 | 2 | 3 | 4 |
    Y | 47 | 43 | 39 | 35 | 31 |

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