Answer;
SYSTEM. Option B is correct
Explanations;
Linear equations are equations with the highest degree of 1. We can have a linear equation containing 2 or 3 variables or even more.
A typical example of a linear equation having two variables is 2x + y = 3 where x and y are the variables.
When we have two or more of these linear equations taken together, they become a system, hence, they are called SYSTEMS of linear equations.
Examples of two systems of linear equation is;
2x + 3y = 7
x - y = 8
This is a system of two equations containing two-variables
Another example of systems of linear equations containing 3-variables is;
a - b + c = 5
2a + 5b - c = 1
3a - 2b + 3c = 4