For the above expression:

f(x,y) = 3x+7y/x+y, where x+y != 0, if the value of f(x,y) = 4, the expression can be reduced to:

f(x,y) = 4 = 3x+7y/x+y

=> x = 7y - 4y

=> x = 3y

From the table of values given I am assuming we are to select two values which are fit the equation f(x,y).

Bunuel wrote:

In the table, select a value for x and a value for y corresponding to f(x,y) = 4. Make only two selections, one in each column.

x --- y

------- 3

------- 5

------- 7

------- 9

------- 12

The only values which match the above condition are 3 and 9. Hence f(

9,3) = 4. **edited as rajmatthew pointed out. Thanks Raj!

Please correct me if I am wrong!

Regards,

Arpan

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