If y + 2x = 4 and y – 3x = -1, find the value of (x + y)
-
A.
3 -
B.
2 -
C.
1 -
D.
-1
Correct Answer: Option A
Explanation
y + 2x = 4 …..(1)
9 – 3x = -1 ……(2)
Substract (2) from (1)
2x – (-3x) = 4 – (-1)
2x + 3x = 4 + 1
5x = 5
X = (frac{5}{5})
= 1
Substitute 1 for x in (1);
y + 2(1) = 4
y + 2 = 4
y = 4 – 2 = 2
Hence, (x + y) = (1 + 2)
= 3