Tesla Inc. shares slid in premarket trading after slashing prices of its vehicles sold in the US. The goal is to attract new buyers as the electric vehicle maker struggles with a significant demand problem. Price cuts span across much of Tesla's lineup and now allow buyers to take advantage of the $7,500 US government tax credit. It lowered the cost of the cheapest Model Y by 20%, reducing the price by as much as $21,000 to $52,990, not including fees and taxes. That enables buyers to qualify for the tax incentive by putting the vehicle under a…