A linear equation in two variables has infinitely many solutions. We can plot these solutions on a graph. Each solution represents a point on the graph, Let us take any three solutions and plot them on the graph as P, Q and R, we will see that on joining these three points we get a straight line passing through them. We find that a linear equation in two variables is geometrically represented by a line such that:
(i) Every solution of the linear equation represents a point on the line.
(ii) Every point on the line is a solution of the linear equation.
Illustration: Draw the graph of the equation y-x=2
Solution: We will try to find three solutions for the linear equation,
When we have :
When we have :
When we have :
Thus, we have the following table exhibiting the abscissae and ordinates of points on the line represented by the given equation
x | 1 | 3 | 4 |
y | 3 | 5 | 6 |
Plotting the points (1,3), (3,5) and (4,6) on the graph paper and drawing a line joining them , we obtain the graph of the line represented by the given equation
The distance between the graph lines of the equations x=3 and x=-7 is | |||
Right Option : D | |||
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Choose the graph of the equations x - 2y = 2 and x + 2y = 1 in the same graph. Find the coordinates of the point of intersection of these two lines. | |||
Right Option : A | |||
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The pair of equation x=a and y=b graphically represents lines which are | |||
Right Option : D | |||
View Explanation |
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