There are 400 seats in the jefferson middle school auditorium. the student are using 3/5 of the seat. there are 65 seat being used by teacher. how many seats are not being used in the auditorium?

175 seats are not being used

Step-by-step explanation:

3/5 of 400 hundred is 240 because 400 divided by 5 is 80 and 80 times 3 is 240.

next subtract the seats being used by teachers from 240

240-65= 175

so 175 seats are not being used

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:

the answer is ! ?