### Mathematics Class IX

Number Systems
Polynomials
Coordinate Geometry
Lines and Angles
Triangles
Quadrilaterals
Circles
Constructions
Heron’s Formula
Surface Areas and Volumes
Statistics
Probability

# Graph of a Linear Equation in Two Variables

To draw the graph of linear equation in two variables, we need to draw a table to write the solutions of the given equation, and then plot them on the Cartesian plane.

By joining these coordinates, we get the line of that equation.

• The coordinates which satisfy the given Equation lies on the line of the equation.
• Every point (x, y) on the line is the solution x = a, y = b of the given Equation.
• Any point, which does not lie on the line AB, is not a solution of Equation.

Example:

Draw the graph of the equation 3x + 4y = 12.

Solution:

To draw the graph of the equation 3x + 4y = 12, we need to find the solutions of the equation.

Let x = 0

3(0) + 4y = 12

y = 3

Let y = 0

3x + 4(0) = 12

x = 4

Now draw a table to write the solutions.

Now we can draw the graph easily by plotting these points on the Cartesian plane.

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