Which of the following is a linear function?

y = 3x^2
y = 1 over 3x
y = x^3 + 5
2 over 3x = y − 1

y= 1 over 3x

Step-by-step explanation:

any linear function graphs a straight line and if you need multiple answers then 2 over 3x = y- 1 is also a lineat function

y= 1 over 3x

Step-by-step explanation:

I thought it was 2 over 3x but it was wrong so it has to be y= 1 over 3x

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18