Provide your best answer for the following math problem. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The problem is: in the rectangular coordinate system , what is the x - intercept of a line passing through ( 10 , 3 ) and ( − 12 , − 8 ) ?
4
-2