Chapter I : Linear Equations in two variables in two variables

Example 4. Solve the following system of equation:

Solution: multiplying equation (1) by 4 and equation (2) by 7 we get

Subtracting (3) fr0m (4) we get

Or, 19/v = 38

Or, 36 v = 19

Or, v = 19/38

Or, v = 1/2

Putting v = 1/2 in (1) we get

Or, 22 - 7/u = 1

Or, 21 = 7/u

Or, 21u = 7

Or, u = 7/21

Or, u = 1/3