The full step-by-step solution to problem: 20 from chapter: Chapter 3 was answered by , our top Math solution expert on 03/09/18, 06:45PM. Since the solution to 20 from Chapter 3 chapter was answered, more than 211 students have viewed the full step-by-step answer. California Algebra 2: Concepts, Skills, and Problem Solving was written by and is associated to the ISBN: 9780078778568. The answer to “Solve each system of equations by using either substitution or elimination.” is broken down into a number of easy to follow steps, and 11 words. This full solution covers the following key subjects: . This expansive textbook survival guide covers 114 chapters, and 7118 solutions. This textbook survival guide was created for the textbook: California Algebra 2: Concepts, Skills, and Problem Solving, edition: 1.