A linear equation represents a straight line in the plane. I am not sure where you are having problems with linear equations but I can suggest a few things you can look at. These are answers to previous questios we have received.
Graphing a linear function shows how to graph a linear function.
Ax + By = C is an exercise in solving for A, B abc C in the linear equation Ax + By = C.
Y-intercept is an explanation of the term Y-intercept.I hope this helps,