14x-21y+42 should be your answer. hope it helps :)
Slope = mx+b
or
x2-x1/y2-y21
You start by doing 65.20 (the bill) divided by 5 (the amount of people paying)
65.20 / 5 = 13.04
Then you add 13.04 (how much each person paid towards the bill) and 2.75 (the amount of money each person left as a tip)
13.04 + 2.75 = 15.79
Each person paid $15.79
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Total area = 12 + 18 = 30cm²
