It is known that, if x+y=10,then x+y+z=10+z. Which Euclid’s axiom illustrates this statement?

Euclid’s second axiom illustrates that, if equals are added to equals, then wholes are equal.

It is known that, if x+y=10,then x+y+z=10+z. Which Euclid’s axiom illustrates this statement?

Euclid’s second axiom illustrates that, if equals are added to equals, then wholes are equal.