Solve the following pair of linear equations by the method of substitution: $x + 8y = 19$ and $2x + 11y = 28$.

$A$ number is $3$ less than another number. By adding $17$ to twice the larger number,it becomes thrice the smaller number. Find these numbers.

The total weight of a father and his son is $70 \, kg$. The weight of the son is one-sixth of the weight of his father. Find the weight of the father and the son.

By the method of substitution,solve the following pair of linear equations: $2x + 3y = 11, 2x - y = -1$

For the pair of equations $2x + 3y = 10$ and $3x - y = 4$,find the value of $x$.

Solve the following pair of linear equations by the method of substitution: $2x - y + 3 = 0$ and $y = 2x - \frac{3}{2}$.