Given:
two-Proof are given and it should be named.
[tex]\bar{1.VZ}\approx\bar{VY}\text{ and }\bar{\text{WY}}\approx\bar{XZ}[/tex]
Above proof is by Definition of segments.
[tex]2.VZ=VY\text{ and WY}=XZ[/tex]
Above proof is by Definition of segments.
[tex]3.\text{ }VZ=VX+XZ\text{ and VY=}VW+WY[/tex]
Above proof is by Segment of Addition Postulate.
[tex]4.VX=XZ=VW+WY[/tex]
Above equation is wrong actually it is VX+XZ=VW+WY
and it is by Addition Property of Equality
[tex]5.VX+WY=VW+WY[/tex]
Above equation is by Substitution Property (2nd use)
[tex]6.VX=VW[/tex]
Above equation is by Substitution Property.