Given that x + y = 7 and 3x-y = 5, evaluate (frac{y}{2}-3).
-
A.
-1 -
B.
1 -
C.
3 -
D.
4
Correct Answer: Option A
Explanation
(x + y = 7 — I\
3x – y = 5 — II)
Add I and II;
(4x = 12 => x = frac{12}{4} = 3\
Y = 7 – 3 = 4, evaluate hspace{1mm} frac{y}{2} – 3\
frac{4}{2} – 3 => 2-3 = -1)