Are the functions linear or nonlinear?

Column A
Column B

1.

72 = x3 + y
2.

y + 1 = 5(x – 9)
3.

7y + 2x = 12
4.

4y = 24
A.

linear
B.

nonlinear A

Question

Are the functions linear or nonlinear?

Column A
Column B

1.

72 = x3 + y
2.

y + 1 = 5(x – 9)
3.

7y + 2x = 12
4.

4y = 24
A.

linear
B.

nonlinear A

anonymous · Answer

@hartnn  @Here_to_Help15  @Hero  @hemmoji

anonymous · Answer

@mathmath333 @mathstudent55

mathmath333 · Answer

a linear function will have the the power of x and y less that equal to 1 

$\Large x^{0\leq 1}$ and $\Large y^{0\leq 1}$

mathmath333 · Answer

$72 = x^{\boxed 3 }+ y$ 

$\uparrow $ this is not linear function

mathmath333 · Answer

where as example 
$x^1+y^1=1$ is linear function

mathmath333 · Answer

so identify them the power of variables should be less or equal to $1$

anonymous · Answer

so would it be 1.B 2.A 3.A 4.A??

mathmath333 · Answer

yes

anonymous · Answer

OK THANK YOU