If 2x + y = 14 and y - x = 5, find y.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 8.
If 2x + y = 14 and -x + y = 5, find y.
2x + y = 14 ----------------- (i)
-x + y = 5 ----------------- (ii) (multiplied by '-')
Solving both the equations:
3x = 9 → x = 3
Putting the value of x in eq. (ii),
-x + y = 5
-3 + y = 5
y = 5 + 3 = 8