SOLUTION: I don't know how to figure this out On thursday marie worked for 6 hours and handled 20 calls. On friday marie worked 8 hours and handled 30 calls. If she worked 4 hours how many c

Question 104389: I don't know how to figure this out On thursday marie worked for 6 hours and handled 20 calls. On friday marie worked 8 hours and handled 30 calls. If she worked 4 hours how many calls did she take? Please help I think the m=5 but i'm not sure what to do next.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
On thursday marie worked for 6 hours and handled 20 calls. On friday marie worked 8 hours and handled 30 calls. If she worked 4 hours how many calls did she take?
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You have two points: (6,20) and (8,30)
slope = (30-20)/(8-6) = 5
Equation form is: calls = (slope)(hours)+b
Substitute to find "b", as follows:
20 = 5*6 + b
b = -10
EQUATION:
calls = 5(hours)-10
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Let # of hours be 4
Then # of calls = 5*4-10 = 10
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Marie took 10 calls
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Cheers,
Stan H.
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