Mathematics
Grade-8
Easy

Question

What is the graphical representation of the following equations?
3x + 6y = 3900 and x + 2y = 1300

  1. Intersecting lines   
  2. Parallel lines
  3. Overlapping lines      
  4. None of the above

hintHint:

There are countless possible answers for a system of linear equations. The number that makes every equation in a system of linear equations true is the system's solution. The answers to the two variables in the two equations will be these points' coordinates.
In this question we have asked the graphical representation of the equations: 3x + 6y = 3900 and x + 2y = 1300

The correct answer is: Overlapping lines


    The value or values that hold true for each equation in the system constitute the solution to the system of equations. How many solutions there are for a system can be determined from the graphs of its equations.
    If the point of intersection is the only location where the two graphs meet when the lines cross, the coordinates of that location provide the answer to the equations involving the two variables.
    fraction numerator a 1 over denominator a 2 end fraction not equal to fraction numerator b 1 over denominator b 2 end fraction
    There are no solutions when the lines are parallel. There are always infinitely many solutions when the two equations graph as the same line.
    fraction numerator a 1 over denominator a 2 end fraction equals fraction numerator b 1 over denominator b 2 end fraction not equal to fraction numerator c 1 over denominator c 2 end fraction
    When the lines are coinciding with each other then there is infinite number of solutions.
    fraction numerator a 1 over denominator a 2 end fraction equals fraction numerator b 1 over denominator b 2 end fraction equals fraction numerator c 1 over denominator c 2 end fraction
    Now we have given the equations as:
    3 x space plus space 6 y space equals space 3900
x space plus space 2 y space equals space 1300
    Comparing it, we get:
    3 over 1 equals 6 over 2 equals 3900 over 1300
S i m p l i f y i n g space i t comma space w e space g e t colon
3 over 1 equals 3 over 1 equals 3 over 1
    So it shows that the lines are coinciding lines and an infinite number of solutions.

    So here we were asked about the nature of the equations, so we used the concept of linear equations and understood with an example that when two lines are coinciding with each other, there is an infinite number of solutions for these pair of equations.

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