Which equation is a direct variation function?

y = 4
y = 1/3x+ 4
y = x
y = x3

y=4

Step-by-step explanation:

its asking which one you can answer without any more context, in this case its y=4 because all the other ones evolving x lead to a rabbit hole and will take you in circles.

y=x

Step-by-step explanation:

direct variation form is y = kx where 'k' is the constant of variation

y=4  This has no 'x' variable

y = 1/3x+4  The constant of variation is 1/3 but then 4 is added, so no direct

y = x³  The 'x' variable must be to the power of one

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".