Linear Equations In Two Variables.

The total cost of two pens is Rs.20/-. If the cost of one pen is Rs.2/- then the cost of other pen is Rs. 18/-. If the cost of one pen is Rs. 4/- then the other pen cost Rs. 16/-

We can write an equation using the variables** x** and

The equation is ** x**+

** x** = 2 and

Similarly** x** = 4 and

** x** = 2 and

** x** = 4 and

** x** = 8 and

Any Equation of the first degree having two varibles such as ** x** and

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