What does consistent or inconsistent means?
How to determine if an equation is graphically consistent or inconsistent?
Class 10th, rd sharma
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Solution:
Given,
x – 2y = 2……. (i)
4x – 2y = 5……. (ii)
For equation (i),
⇒ y = (x – 2)/2
When x = 2, we have y = (2 – 2)/2 = 0
When x = 0, we have y = (0 – 2)/2 = -1
Thus, we have the following table giving points on the line x – 2y = 2
For equation (ii),
We solve for x:
⇒ x = (5 + 2y)/4
So, when y = 0
x = (5 + 2(0))/4 = 5/4
And, when y = 1.5
⇒ x = (5 + 2(1))/4 = 7/4
Thus, we have the following table giving points on the line 4x – 2y = 5
Graph of the equations (i) and (ii) is as below:
It is clearly seen that the two lines intersect at (1,0).
Hence, the system of equations is consistent.