Reading the question, here is what I think the variables mean:
P = Price and Q = Quantity
So we are trying to figure out the price. Thus, we have to isolate P from the rest. Here’s my work:
1) I started off with subtracting 100 from both sides. Q - 100 = -2P
2) I divided the -2 from both sides to get P alone. (Q - 100) ÷ -2 = P
That’s all! Now you can just enter the quantity and you’ll find the price using that equation.
Answer: (Q - 100) ÷ -2 = P
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I hope you understood! Feel free to make this in your own words! If you don’t understand, try commenting and I’ll explain. Thanks! -Doodle
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