Identify the property that justifies each step asked about in the answer area below.
\text{Line 1: }\phantom{=}
Line 1: =
\,\,(4x)(7y)
(4x)(7y)
\text{Line 2: }\phantom{=}
Line 2: =
\,\,4\cdot (x\cdot 7)\cdot y
4⋅(x⋅7)⋅y
\text{Line 3: }\phantom{=}
Line 3: =
\,\,4\cdot (7\cdot x)\cdot y
4⋅(7⋅x)⋅y
\text{Line 4: }\phantom{=}
Line 4: =
\,\,(4\cdot 7)(x\cdot y)
(4⋅7)(x⋅y)
\text{Line 5: }\phantom{=}
Line 5: =
\,\,28xy
28xy

Line 1 to Line 2:
Line 2 to Line 3:
Line 3 to Line 4: