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OpenStudy (anonymous):
DG's Plumbing and Heating charges $50 plus $70 per hour for emergency service. Bill remembers being billed just over $400 for an emergency call. How long to the nearest hour was the plumber at Bill's house?
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OpenStudy (anonymous):
linear equation y=70x+50
OpenStudy (anonymous):
y = total so sub 400 =70x+50............ x=5 hours
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