Hello, I need help with an equation
i did it, but it looks like it needs revision
• A teacher is looking for the best option in purchasing school supplies for a classroom. Company A is offering a discount for every dollar amount spent; Company B is offering a higher discount than Company A, but the discount is applicable only for every dollar amount spent above $20. Determine which company will offer a better price based upon the dollar amount the teacher spends on school supplies.

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yes i do
there are three separate formulas
y=0.8x
y=0.7x+6 and y=x

I am having trouble with the excel graph, and i don't know if something is just not adding up

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