You'll need 2 more lines to complete this two column proof.
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Line 4
For the "statement" portion, you'll say something like
The reason for this statement is "transitive property"
We're basically combining lines 1 and 3 to form this new line.
The transitive property is the idea that if A = B and B = C, then A = C. We connect the statements like a chain.
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Line 5
The statement is what you want to prove since this is the last line.
So the statement is
The reason is "converse of corresponding angles theorem"
As you can probably guess, this theorem says "If two corresponding angles are congruent, then the lines are parallel".