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Big Ideas Math Integrated I, 2016 View details

2. Solving Systems of Linear Equations by Substitution

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Exercise 3 Page 223

What is the Substitution Method all about?

See solution.

Practice makes perfect

There are two methods to solve a system of equations by substitution:

Solve for x first.
Solve for y first.

By solving one of the equations in the system for one of the variables, we can then substitute the resulting expression into the other equation. We now have one equation in only one variable. This means the value of the single variable can be found. Finally, we can substitute this value in the first equation to find the full answer.