Write an equation of a line passing through the point representing solution of the pair of linear equations x + y = 2 and 2x – y = 1. How many such lines can we find?
Solution:
Given equations are x + y = 2
2x – y = 1
x + y = 2
x | 1 | 2 | 3 |
y | 1 | 0 | -1 |
2x – y = 1
x | 1 | 2 | 3 |
y | 1 | 3 | 5 |
From the graph it is clear that two lines AB and CD intersect and point E (1, 1) Hence infinite lines can pass through the intersecting point E like 4 = x, 2x – y = 1 etc.