What value of x would prove a || b (a parallel to b)? (Hint: Add consecutive interior angles to solve for x).

We have a || b (a parallel to b), the interior angle property. Therefore, the value of x would be 8.
The sum of all the interior angles of parallel lines is equal to 180 degrees.
We have a || b (a parallel to b), the interior angle property
19x - 13 + 6x - 7 = 180
25x - 20 = 180
25x= 200
x = 8
Therefore, the value of x would be 8.
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