Azul bought 10 reams of paper at the store for a total of 84$. The tax was on the purchase was 4$. What was the cost of each ream? Which equation could be used to represent this situation?
A.10r-84=4
B.10r-4=84
C.10r+4= 84
D.4-10r=84

A linear equation is an equation that has the variable of the highest power of 1. The standard form of a linear equation is of the form Ax + B = 0.

Azul bought 10 reams of paper at the store for a total of 84$. The tax on the purchase was 4$.

Let's the cost of each ream be $r.

Then the cost of 10 reams is given by $10r

Now, it is given that the tax on the purchase was $4. Hence, we must add this value to our above cost which is $10r

hence, the total cost should be 10r+4

Now, It is given that the cost was $84.

Therefore, we have the equation

10r+4= 84

10r = 84 - 4

r = 80/10

r = 8

Thus, C is the correct option.

Learn more about linear equations;

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Azul bought 10 reams of paper at the store for a total of 84$. The tax was on the purchase was 4$. What was the cost of each ream? Which equation could be used to represent this situation? A.10r-84=4 B.10r-4=84 C.10r+4= 84 D.4-10r=84

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What is a linear equation?

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Azul bought 10 reams of paper at the store for a total of 84$. The tax was on the purchase was 4$. What was the cost of each ream? Which equation could be used to represent this situation?
A.10r-84=4
B.10r-4=84
C.10r+4= 84
D.4-10r=84