en.wikipedia.org/wiki/System_of_linear_equations

the entire **solution** set can also be expressed in matrix form. ... not hold, the
**equation system** is inconsistent and has no **solution**.

www.khanacademy.org/math/cc-eighth-grade-math/cc-8th-systems-topic/cc-8th-systems-with-substitution/a/systems-of-equations-with-substitution

Walk through examples of **solving systems of equations** with substitution.

www.khanacademy.org/math/algebra-home/alg-system-of-equations/alg-equivalent-systems-of-equations/v/solving-systems-of-equations-by-elimination

An old video where Sal introduces the elimination method for **systems** of linear
**equations**.

www.khanacademy.org/math/algebra-home/alg-system-of-equations/alg-solving-systems-of-equations-with-substitution/v/solving-linear-systems-by-substitution

An old video where Sal introduces the substitution method for **systems** of linear
**equations**.

www.purplemath.com/modules/systlin5.htm

The addition method of **solving systems of equations** is also called the method of
elimination. This method is similar to the method you probably learned for ...

www.mathpapa.com/calc/tutorial/solving-systems-of-equations

Learn how to use the Algebra Calculator to **solve systems of equations**. Example
Problem. Solve the following system of equations: x+y=7, x+2y=11. How to ...

www.symbolab.com/solver/system-of-equations-calculator

Free system of equations calculator - **solve system of equations** step-by-step.

www.mathplanet.com/education/algebra-1/systems-of-linear-equations-and-inequalities/the-substitution-method-for-solving-linear-systems

A way to **solve** a linear **system** algebraically is to use the substitution method. ...
We can substitute y in the second **equation** with the first **equation** since y = y.