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2 January, 10:36

Suppose that it costs $25 to place a classified advertisement in the newspaper, plus $3 for each line. Then the cost to place an ad x lines long is given by y dollars, where y=3x+25. Express an ordered pair the fact that a 2 line ad cost $31

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  1. 2 January, 10:55
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    Substitute 2 for x:

    y = 3 (2) + 25

    y = 6 + 25

    y = 31

    in (x, y) form:

    (2, 31)
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