Are you graphing those individually? Easiest way would be to find the x-intercept (by solving for x when y = 0) and the y-intercept (by solving for y when x = 0) and connect them with a line, extending both ways.
What do you mean? Lets say for the equation -4x + 5y = 0. Choose any number for x and solve for y to get its corresponding value. This gives you another set of numbers, a coordinate point, which satisfies the equation. Then, connect the two points with a line.