Number 1, rate of change = $5 per hour, initial value = $20, equation: y=5x+20, Interpretation: They started with an initial fee of $20, then paid $5 per hour., Number 2, rate of change: $5 per month, initial value: $7.50, equation: y=5x+7.50, Interpretation: They started with an initial fee of $7.50, then paid $5 per month., 3. Word Problem, The cost of having photos taken includes a sitting fee and $12 for each portrait. The cost of 3, 6, and 9 photos respectively is $51, $87, and $123., rate of change: $12 per portrait, initial value: $15, Equation: y=15+12x, Interpretation: They started with an initial fee of $15, then paid $12 per picture..

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