If the following pair of equations does not have any solution,then find the value of $k$:
$3x - 4y + 7 = 0$
$kx + 3y - 5 = 0$

$A$ shopkeeper gives books on rent for reading. She takes a fixed charge for the first two days,and an additional charge for each day thereafter. Latika paid $Rs. 22$ for a book kept for six days,while Anand paid $Rs. 16$ for the book kept for four days. Find the fixed charges and the charge for each extra day (in $Rs.$).

The age of the father is twice the sum of the ages of his two children. After $20$ years,his age will be equal to the sum of the ages of his children. Find the age of the father (in years).

The solution set of the pair of equations $x = -2$ and $y = 3$ is:

Solve the following pair of linear equations using a graph: $x+y=5$ and $3x+3y=15$.

The father's age is six times his son's age. Four years hence,the age of the father will be four times his son's age. The present ages,in years,of the son and the father are,respectively