Given that x y 7 and 3x-y 5 evaluate frac y 2 -3 - WAEC Mathematics 2004 Question
Given that x + y = 7 and 3x-y = 5, evaluate \(\frac{y}{2}-3\).
A
-1
B
1
C
3
D
4
correct option: a
\(x + y = 7 ------ I\
3x – y = 5 ------ II\)
Add I and II;
\(4x = 12 => x = \frac{12}{4} = 3\
Y = 7 – 3 = 4, evaluate \hspace{1mm} \frac{y}{2} – 3\
\frac{4}{2} – 3 => 2-3 = -1\)
3x – y = 5 ------ II\)
Add I and II;
\(4x = 12 => x = \frac{12}{4} = 3\
Y = 7 – 3 = 4, evaluate \hspace{1mm} \frac{y}{2} – 3\
\frac{4}{2} – 3 => 2-3 = -1\)
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