Seudónimo Seudónimo
  • 02-06-2019
  • Mathematics
contestada

Really need answer, don't understand what it want:

Really need answer dont understand what it want class=

Respuesta :

jimrgrant1 jimrgrant1
  • 02-06-2019

Answer:

y ≈ - 3.8

Step-by-step explanation:

Given the 2 equations

5x + 2y = 21 → (1)

- 2x + 6y = - 34 → (2)

To eliminate the terms in x , multiply (1) by 2 and (2) by 5

10x + 4y = 42 → (3)

- 10x + 30y = - 170 → (4)

Add (3) and (4) term by term

(10x - 10x) + (4y + 30y) = (42 - 170)

34y = - 128 ( divide both sides by 34 )

y ≈ - 3.8 ( to the nearest tenth )

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