(06.07 HC) Which expression is equivalent to 19x − 6x + 2 and why? (1 point) Select one: a. 15x, because 19x − 6x + 2 = 13x + 2 = 15x b. 11x, because 19x − 6x + 2 = 19x − 8x = 11x c. 2 + 13x, because (19x − 6x) + 2 = 13x + 2 = 2 + 13x d. 2 − 13x, because (19x − 6x) + 2 = −13x + 2 = 2 − 13x

i dont get it. where are the "descriptions"?

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: