To simplify the equation, let us consider-
We should also change the second term in y form-
By putting the value of x from equation (1) in (2)
Now, to solve this polynomial equation we find the factors of the constant value 60 and substitute y with each factor for checking whether it makes the equation equals 0. Whichever factor will make the equation equals 0 will be the value of y.
So the factors of 60 are = 5×4×3
By substituting 5 in place of y,
Now we check the next factor 4
Hence, y = 4
Note: We could also do above calculations mentally to save the time.
From the equation (1) we know that
Hence, the correct choice is option (b)
You can read below concepts to solve this type of questions:
Request: If you like this explanation, please share it with your friends.