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17 November, 18:34

If 2x + 5y = 21 and x + y = 3, then what is the value of x?

a x=-5

b x=2

c x=5

D x=-2

+4
Answers (2)
  1. 17 November, 18:46
    0
    D

    Step-by-step explanation:

    Given the 2 equations

    2x + 5y = 21 → (1)

    x + y = 3 → (2)

    Rearrange (2) expressing y in terms of x, by subtracting x from both sides

    y = 3 - x ← Substitute into (1)

    2x + 5 (3 - x) = 21 ← distribute and simplify left side

    2x + 15 - 5x = 21

    - 3x + 15 = 21 (subtract 15 from both sides)

    - 3x = 6 (divide both sides by - 3 x = - 2 → D
  2. 17 November, 18:47
    0
    The answer in the math is D
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