Algebra 1 Flexbooks 

Unit and Topic
Ck-12 Flexbook link
Unit 1 Topic 1
http://www.ck12.org/user:YWxnZWJyYXN1bW1pdDVAZ21haWwuY29t/book/
Unit-1-Topic-1:-Linear-Equation-in-One-Variable/r2
Unit 1 Topic 2
http://www.ck12.org/user:YWxnZWJyYXN1bW1pdDRAZ21haWwuY29t/book/
Unit-1-Topic-2:-Linear-Inequalities-in-One-Variable-2/r1
Unit 1 Topic 3
http://www.ck12.org/user:YWxnZWJyYXN1bW1pdDFAZ21haWwuY29t/book/
Unit-1-Topic-3:-Exponential-Equations-in-One-Variable/r25
Unit 2 Topic 1
http://www.ck12.org/user:MCPS/book/Unit-2-Topic-1:-Characteristics-ofFunctions/r8/section/1.0/
Unit 2 Topic 2
http://www.ck12.org/user:MCPS/book/Unit-2-Topic-2:-Constructing-andComparing-Linear-and-Exponential-Functions/r9/section/1.0/
Unit 2 Topic 3
http://www.ck12.org/user:YWxnZWJyYXN1bW1pdDFAZ21haWwuY29t/book/
Unit-2-Topic-3:-Systems-of-Equations-and-Inequalities-in-Two-Variables/r80
Unit 3
http://www.ck12.org/user:MCPS/book/Unit-3:-DescriptiveStatistics/r6/section/1.0/
Unit 4 Topic 1
http://www.ck12.org/na/Unit-4-Topic-11/lesson/user:YWxnZWJyYXN1bW1pdDVAZ21haWwuY29t/Unit-4-Topic-1:Quadratic-Relationships/r32
Unit 4 Topic 2
http://www.ck12.org/user:YWxnZWJyYXN1bW1pdDRAZ21haWwuY29t/book/
Unit-4-Topic-2:-Structure-of-Quadratic-Expressions/r19
Unit 4 Topic 3
http://www.ck12.org/user:MCPS/book/Unit-4-Topic-3:-Solving-QuadraticEquations/r10/section/1.0/
Unit 5
In process