Garvey's electronic store is having a storewide sale. for a television set with a regular price of x dollars, a 15 percent discount is equal to $30. which of the following equations could not be used to determine x?
0.15x=x-30
0.85x=x-30
x-0.15x=x-30
0.15x=30

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:

answer: the answer is ann