Introduction to Systems of Linear Equations: Two Variables

Learning Objectives

By the end of this section, you will be able to:

Solve systems of equations by graphing.
Solve systems of equations by substitution.
Solve systems of equations by addition.
Identify inconsistent systems of equations containing two variables.
Express the solution of a system of dependent equations containing two variables using standard notations.

Skateboarders at a skating rink by the beach.

(credit: Thomas Sørenes)

A skateboard manufacturer introduces a new line of boards. The manufacturer tracks its costs, which is the amount it spends to produce the boards, and its revenue, which is the amount it earns through sales of its boards. How can the company determine if it is making a profit with its new line? How many skateboards must be produced and sold before a profit is possible? In this section, we will consider linear equations with two variables to answer these and similar questions.

Licenses & Attributions

CC licensed content, Original

Revision and Adaptation. Provided by: Lumen Learning License: CC BY: Attribution.

CC licensed content, Shared previously

College Algebra. Provided by: OpenStax Authored by: Abramson, Jay et al.. License: CC BY: Attribution. License terms: Download for free at http://cnx.org/contents/[email protected].

CC licensed content, Specific attribution

Precalculus. Provided by: OpenStax Authored by: OpenStax College. Located at: https://cnx.org/contents/[email protected]:1/Preface. License: CC BY: Attribution.

أدلة الدراسة > College Algebra