Luis's cell phone plan costs $39 per month. Text messages cost an additional $0.15 each. If Luis's cell phone bill last month to
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the equilibrium point, is when Demand = Supply, namely, when the amount of "Q"uantity demanded by customers is the same as the Quantity supplied by vendors.
That occurs when both of these equations are equal to each other.
let's do away with the denominators, by multiplying both sides by the LCD of all fractions, in this case, 12.