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प्रश्न
If 3x + 5y = 9 and 5x + 3y = 7, then find the value of x + y.
बेरीज
उत्तर
Given, 3x + 5y = 9 ......(i)
5x + 3y = 7 ......(ii)
On adding equation (i) and (ii), we get
3x + 5y = 9
+ 5x + 3y = 7
8x + 8y = 16
∴ 8(x + y) = 16
x + y = `16/8` = 2
∴ x + y = 2
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Linear Equation in Two Variables
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