If 3 = x and x = y, then 3 = y is an example of which algebraic property?

That is the Transitive Property of  Equality.

Step-by-step explanation:

x is both equal to 3 and to y,  so y = 3.

You might say it's common sense, really.

b. y = 4x - 2

step-by-step explanation:

to find a parallel equation to an equation, make sure both equations have the same slope but different y-intercepts.

y = 4x + 1

4 = slope

1 = y-intercept

y = 4x - 2

4 = slope

-2 = y-intercept

they both have the same slope but different y-intercepts, so, b. is the correct answer.

and to check your work, you can graph both equations. : )