This is a whole lesson on Simultaneous Equations by Substitution that is KS3, GCSE and IGCSE ready. This is the second lesson looking at the concept of simultaneous equations and teaching how to solve ...

Learn how to solve systems of equations in Algebra 1 using the substitution method! Lizzie guides you step-by-step through isolating variables, working with coefficients of 1 and -1, and applying the ...

Grade school math students are likely familiar with teachers admonishing them not to just guess the answer to a problem. But a new proof establishes that, in fact, the right kind of guessing is ...