If y + 2x = 4 and y - 3x = -1, find the value of (x + y)

  • A 3
  • B 2
  • C 1
  • D -1
waec 2018mathematics

The correct answer is A. 3

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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