Question

Definition, Property, Postulate, or Theorem that justifies.
If XY=WZ the XY+TU=WZ+TU
I need the name of the theorem or postulate.

Answer 1

hint :they adding TU both side

Answer 2

When you solve an equation, such as this one:
x - 2 = 5
by doing this: x - 2 + 2 = 5 + 2 (adding 2 to both sides)
What allows you to add the same number to both sides?

Answer 3

so what theorem?

Answer 4

You are adding the same amount to both sides.
It is the Addition Property of Equality.

Answer 5

you are adding so it relates to add

Answer 6

thx

Answer 7

yw