Algebra I: Determine if a systems of equations has no solution
 This is a free lesson from our course in Algebra I

 In this lesson, we'll explain how to find out whether a system of equations has no solution. In a system of two linear equations Ax + By + C = 0 and Dx + Ey + F = 0, the only circumstance in which the system of equation would have no solution is when the lines are parallel, i.e. they have the same slope and they don't overlap. Then there can be no points that are common to both lines. In case of this system of two linear equations, the two lines are parallel if A/B = D/E. For example, 5x - 3y = 1 and 15x - 9y = 5 have no solution because A/B = D/E = -5/3. (More text below video...)
Other useful lessons:
 Finding intersection points graphically Determine if a system of equations has infinite solutions
(Continued from above) For example, Solve the system of linear equations.
4x - y = 8
-8x + 2y = -5
Steps to solve this example:
• multiply all terms in the first equation by 2,
8x - 2y = 16
-8x + 2y = -5