Elimination Method of Finding Solution of a Pair of LE

Q.

A father says to his son. "7 years ago my age was seven times your age, while 3 years hence my age will be three times your age". Find their present ages?

Q.

Solve the following pair of linear equations by the substitution method:

$$\begin{gathered} 0.2x+0.3y=1.3 \\ 0.4x+0.5y=2.3 \end{gathered}$$

Q.

Six years ago , the age of a father was thrice the age of his son. Six years hence , his age will be double the age of his son. Find their present age?

Q.

How do you do linear programming?

Q.

In a parallelogram , one angle is $\frac{4}{5}$^th of its adjacent angle. Then the angles of the parallelogram are

1. 60, 75

2. 100, 80

3. 48, 60

4. 80, 64

Q.

Form a valid equation with the given solution.

$\mathrm{h}=11$