Mathematics, 30.06.2019 03:30 MariaGuerra

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. what is the sitting fee ? i have to uses the formula y=mx+b to solve

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The cost of having photos taken includes a sitting fee and $12 for each portrait. the cost of 3,6, a...