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15 April, 05:38

2x+y=-2

x+y=5

the y coordinate of the solution to the system shown is___?

A. 12

B. - 12

C. - 7

D. 7

+5
Answers (1)
  1. 15 April, 07:25
    0
    A

    given the 2 equations

    2x + y = - 2 → (1)

    x + y = 5 → (2)

    subtract (2) from (1) term by term to eliminate y

    (2x - x) + (y - y) = ( - 2 - 5)

    x + 0 = - 7 ⇒ x = - 7

    substitute x = - 7 in either of the 2 equations and solve for y

    (2) : - 7 + y = 5 (add 7 to both sides)

    y = 5 + 7 = 12 → A
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