If y + 2x = 4 and y - 3x = -1, find the value
MATHEMATICS
WAEC 2018
If y + 2x = 4 and y - 3x = -1, find the value of (x + y)
- A. 3
- B. 2
- C. 1
- D. -1
Correct Answer: A. 3
Explanation
y + 2x = 4 .....(1)
y - 3x = -1 ......(2)
Subtract (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
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