8. A music store sells used CDs for $9. They buy used CDs for $4. You have $50 to spend and many old CDs. Write an equation in standard form that models how
many CDs you can buy in this situation.
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9x+4=50

Step-by-step explanation:

In this case, we're looking at how many you can buy, not how many CD's you own.

d

step-by-step explanation:

d

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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