For the linear equation in two variables $3x + 2y = 8$,if the value of $x$ is $-2$,then $y = \dots$

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.

If $2x + y = 35$ and $3x + 4y = 65$,then find $\frac{x}{y}$.

The sum of the present age of a father and twice the present age of a son is $70$ years. Also,the sum of twice the present age of father and the present age of son is $95$ years. Find their present ages.

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

Solve by the method of substitution. Aftab tells his daughter,"Seven years ago,$I$ was seven times as old as you were then. Also,three years from now,$I$ shall be three times as old as you will be." Represent this situation algebraically.