Variables are the unknown quantities in an equation. These can be from a linear equation with one variable, linear equation with two variables and so on. The variable to which we assign a value is referred to as the independent variable, and the other variable is referred to as the dependent variable because its value is dependent on the independent variable. When two linear equations are written the same slope it shows that they are parallel and if the product of two slopes is -1 then two linear equations are referred to as perpendicular to each other.
Teachers should help students identify variables and write equations from a graph problems for better understanding of mathematical operations with variables as it will clear the fundamental concepts.
You can also try Identify Variables And Write Equations From A Graph Worksheet and Identify Variables And Write Equations From A Graph Quiz as well for a better understanding of the concepts.