Which equation is a direct variation function? y = x
y = 4
y = x2
y = x + 2
y= 1/4 x + 2

y=x and y=1

                  4  x

Step-by-step explanation:

We know,

'Direct Variation function' is the function where two quantities vary directly i.e. variables x and y are said to be directly varying if 'y=kx' where k is the constant of variation.Thus, from the options, we see that the function,

y=x

is varying directly with the constant of variation i.e. k = 1.

y= 1

    4 x              

is also varying directly with constant k=1

                                                                 4

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a

step-by-step explanation: