Ruben bought 6 comic books for 21. Each comic book was the same price. What was the cost for 111 comic books?

Step-by-step explanation:

Firstly get the price for 1 comic book

21÷6 = 7/2 or 3.5

3.5 × 111books = 388.5

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below:

step-by-step explanation: yes