Slope-Intercept form tells you the slope and the y-intercept of a line. The slope-intercept equation is y=mx+b, where "m" stands for the slope and "b" is the y-intercept. The only way a line cannot be represented by slope-intercept form is if it is a vertical or horizontal line. For example vertical lines can be represented by x=5, while horizontal lines are represented by y=4.
Find the slope and y-intercept!
First you should find the y-intercept since this is the easiest part of the equation, look vertically over the y axis and you should see where the line meets the y axis. So, the y-intercept of the equation is 5, because it is where it intersects the y-axis. Next you will find the slope, which is rise over run, meaning y will be on top divided by x. The slope is 2 because it goes up 2 and over 1 before it hits the line again!