In one auditorium there are 420 seats, and in the second - 480. In the first hall, compared to the second, there are 5 rows less, but in each row of the first hall there are 10 seats less than in each row of the second. How many seats does each row of the first hall have.

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:

other answer is correct. i had used the radius of the radius somehow. a website:

it's d

step-by-step explanation: