Read this page. This article explains how to find an equation of a line in slope-intercept point when the slope and one point on the line are given, or when two points on the line are given. Practice writing equations by clicking on the "new problem" button at the end of the article, trying a problem, and checking your answer. Attempt to solve 10 problems. You can also create a worksheet of 10 problems by clicking on the button at the bottom of the page titled "Click Here for a Randomly Generated Worksheet and Answers." The answers will be provided at the end of the worksheet.