Learn Algebra Again For the First Time Free Lectures on Algebra from the Khan Academy conveniently organized on your phone. Lectures include Introduction to Algebra, Origins of Algebra and the Beauty of Algebra. Learn to use Algebra to Solve linear equations and solve linear inequalities. Use Algebra to graph linear equations of a line and inequalities. Solve systems of equations and inequalities. Learn about Ratios and Proportions. Learn about Absolute Values and number lines. Learn about Exponents and Radicals Algebra lessons from Khan Academy on Logarithms. How to solve and factor polynomials. Quadratic functions, conic sections. Dealing with Complex Numbers. Matrices, using matrices to solve a system of equations.