题目

In 1885, a young doctor named Conan Doyle opened offices in London. He wanted to be a successful doctor, but for some reasons he never found enough patients. To pass the time, be began to write stories and send them to the newspapers. Conan Doyle’s stories were about a clever detective, Sherlock Holmes. Consn Doyle wrote that Sherlock Holmes lived in Baker Street in London, and people with problems came to Sherlock Holmes with their problems, too. He was able to solve mysteries that the cleverest policemen in England were unable to figure out. Sometimes Sherlock Holmes could solve a myster13．已知y是x的一次函数，当x=3时，y=1；当x=-2时，y=-4，求这个一次函数的解析式．