Question 943262
x = number of minutes
y = total bill (dollars)
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y = 0.10(x - 500) + 30
y = 0.10x - 0.10*500 + 30
y = 0.10x + (30 - 0.10*500)
y = 0.10x - 20
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y = 0.10*632 - 20
y = $43.20
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