Determine which function(s) is not a linear function. Select all that apply.

x = 3

y = |x + 3|
y = 3x

x = 3.

Step-by-step explanation:

x = 3 is not linear. By definition a linear function has 2 variables, a dependent and independent variable. This has only x and a constant. It is a linear equation but not a linear function.

y=x^3/3 ; x=3 ; y= √x-3 ; and y= | x+3 | .

Step-by-step explanation:

In a linear function, we have both a y, an x, and the highest power of each is 1.

In the first function, x has a power of 3; this means it is nonlinear.

In the second function, both y and x have a power of 1; this means it is linear.

In the third function, there is no y; it is an x = c equation, which makes it a vertical line and thus not a function.  This means it is not a linear function.

In the fourth function, we have a square root; this means the power of x is 1/2, not 1, and the function is not linear.

In the fifth function, we have absolute value bars.  This means it is an absolute value function and not a linear function.

In the sixth function, both x and y have a power of 1; this means it is linear.

Step-by-step explanation:

I did this on my test, I hope this helps, good luck, and Brainliest.