How many intersections are there of the graphs of the equations below?x + 5y = 63x + 30y = 36

The resale value of a textbook decreases by 25% with each previous owner. A new textbook is sold for $85. Which function represents the resale value of the textbook after x owners?
Which shows all the values of x that make the rational expression undefined?

Which number line shows the solution set for ?





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