SOLUTION: A 100 ml cup of coffee costs 50. A 120 ml cup of coffee costs 70. How much would an 80 ml cup of coffee costs? I need help to get the equation and I need to graph it.

Question 928065: A 100 ml cup of coffee costs 50. A 120 ml cup of coffee costs 70. How much would an 80 ml cup of coffee costs? I need help to get the equation and I need to graph it.
Answer by TimothyLamb(4379) (Show Source): You can put this solution on YOUR website!
(100,50) (120,70)
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slope = m = dy/dx
m = (50-70)/(100-120)
m = 1
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y - 50 = 1(x - 100)
y - 50 = x - 100
y = x - 50
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y-intercept = (0,-50)
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answer:
x = 80 ml
y = x - 50
y = 80 - 50
y = the cost of an 80 ml cup is 30
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