Plan A: (66-50)/(580-500) = 16/80 = 1/5 = 0.20 per text message over 500
y = 0.2X + 50 if x>500
Plan B: (69-50)/(580-500) = 19/80 = 0.2375 per text message over 500
y = 0.2375 X + 50 if x>500
Bomgi F.
asked 02/28/18Plan A: (66-50)/(580-500) = 16/80 = 1/5 = 0.20 per text message over 500
y = 0.2X + 50 if x>500
Plan B: (69-50)/(580-500) = 19/80 = 0.2375 per text message over 500
y = 0.2375 X + 50 if x>500
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