Description: Learn to convert equations like 4x + 2y = -8 into slope-intercept form. Created by Sal Khan and Monterey Institute for Technology and Education. We're asked to convert these linear equations into slope-intercept form and then graph them on a single coordinate plane. So line A, it's in standard form right now, it's 4x plus 2y is equal to negative 8. The first thing I'd like to do is get rid of this 4x from the left-hand side, and the best way to do that is to subtract 4x from both sides of this equation.*Teacher Advisor is 100% free.