Solving a System of Linear Equations Using Substitution Method

In South Africa, Grade 9 students learn about solving systems of linear equations through various methods, including the substitution method. To solve using this method, follow these steps:

1. Solve one equation for one variable.
2. Substitute the expression obtained in step 1 into the other equation.
3. Solve for the variable.
4. Substitute the value back into either of the original equations to find the value of the other variable.

This method is a fundamental concept in algebra and lays the groundwork for more complex problem-solving in higher grades.