Question:
The pair of linear equations 3x + 2y = 5; 2x − 3y = 7 have
(a) One solution
(b) Two solutions
(c) Many solutions
(d) No solution
Solution:
The two equations are
3x + 2y = 5 …… (1)
2x − 3y = 7 …… (2)
Here,
$a_{1}=3, b_{1}=2, c_{1}=5$
$a_{2}=2, b_{2}=-3, c_{2}=7$
$\frac{a_{1}}{a_{2}}=\frac{3}{2}, \frac{b_{1}}{b_{2}}=-\frac{2}{3}$
$\therefore \frac{a_{1}}{a_{2}} \neq \frac{b_{1}}{b_{2}}$
Therefore, they will intersect each other at a unique point and thus, there will be a unique solution for these equations. That is, there is only one solution.
Hence the correct option is