In order to solve system by graphing, you first need to write each equation in slope-intercept form or y = mx + b form.
In this form, y is isolated on the left side of the equation.
In some problems, this will already be done for you.
After that, graph both lines on a coordinate system.
What you are looking for is the point where the lines intersect.
That point will represent the x and y that is the solution.
Feel free to plot many points along the line.