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Revision Notes: Graphical Solution | Mathematics Class 9 ICSE PDF Download

System of equations can be solved using Algebraic and Graphical methods. 
The general form of a pair of linear equations in two variables is 
a1x + b1y + c1 = 0
a2x + b2y + c2 = 0
where a1, a2, b1, b2, c1, c2 are real numbers, such that Revision Notes: Graphical Solution | Mathematics Class 9 ICSE

Drawing a Graph 

  • Write the given equation with y or x as the subject.  
  • Consider any three suitable values of x and find the corresponding values of y for each of the assumed value of x.
  • Make a table for the different ordered pairs (points) of values x and y.  
  • Draw the axes on the graph paper and choose suitable scale.  
  • Plot these points on the graph paper.  
  • Draw a straight line passing through the points plotted on the graph. 

Solution of Simultaneous Linear Equations Graphically 

  • Draw a graph (straight line) on the same graph paper for each given equation.  
  • Find the coordinates of the point of intersection of the two lines drawn.  
  • The coordinates of the point of intersection give the solution of the given equations. 
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