If 7/x + 8/y = 2; 2/x + 12/y = 20, then x = ?

If

Given pair of equations are

and

On dividing by 2, we get

On multiply equation (1) by 3 and (2) by 4, we get

and

On Subtracting equation (3) from (4), we get

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There are 4 methods to solve this type of pair of linear equations.

1. Method of Substitution

2. Method of Eliminations

3. Method of Cross Multiplication

4. Graphical Method

We prefer here Method of Eliminations :-

To solve systems using elimination, follow this procedure:

Step 1: Multiply each equation by a suitable number so that the two equations have the same leading coefficient.

Step 2: Subtract the second equation from the first to eliminate one variable

Step 3: Solve this new equation for other variable.

Step 4: Substitute the value of variable thus evaluated into either Equation 1 or Equation 2 and get the value other variable.