Yahoo’s revenue and profit slid significantly in the first quarter, but the company’s performance was in line with Wall Street’s expectations. The revenue drop is in part due to a change in how it recognizes the part of its revenue derived from its search advertising agreement with Microsoft. Yahoo’s net revenue was $1.06 billion, down 6 percent year on year but matching the consensus estimate from analysts polled by Thomson Financial. CEO Carol Bartz: “We continue to make headway on our plan to increase profitability and grow revenue””]