Investor disappointment at Lyft Inc’s growth outlook underscores the pressure for rival Uber Technologies Inc to show potential backers of its initial public offering that it can expand services such as food delivery even as its core ride-hailing slows down. Lyft posted its first results as a public company, one of the last data points for investors ahead of Uber’s IPO this week. Lyft, a smaller company, said growth was slowing and losses would shrink after this year.