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2 October, 03:43

A plumber charges an initial amount, x, to make a house call plus an hourly rate, y, for the time he is working. A 1-hour job costs $90 and a 3-hour job cost $210

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  1. 2 October, 04:00
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    X=$30

    y=$60

    1 hour job - 60x1=60+30=90

    3 hour job-60x3=180+30=210
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