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17 August, 15:25

Consider this system of equations and the partial solution below

6x+2y = 6

7x+3y - 9

Multiply the first equation by - 3.

Multiply the second equation by 2

Add the resulting system of equations,

Which terms will cancel when you add the resulting system of equations?

A. - 6y and 6y

B. - 14x and 14x

C. - 32 and 32y

D. - 18x and - 18

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Answers (2)
  1. 17 August, 15:30
    0
    A. - 6 y and 6 y terms will cancel when we add the resulting system of equations.

    Step-by-step explanation:

    Here, the system of equations is given as:

    6 x + 2 y = 6 ... (1)

    7 x + 3 y = 9 ... (2)

    Now, multiplying (1) by (-3), we get

    (-3) 6 x + (-3) 2 y = (-3) 6

    ⇒ - 18 x - 6 y = - 18

    And, multiplying (2) by (2), we get

    (2) 7 x + (2) 3 y = (2) 9

    ⇒ 14 x + 6 y = 18

    Now, adding both the resulting equations, we get

    (-18 x - 6 y) + (14 x + 6 y) = - 18 + 18

    or, (-18 x + 14 x) + (6 y - 6 y) = - 18 + 18

    or, - 4 x = 0

    Hence, the terms + 6 y is cancelled with - 6 y in Left side

    and term 18 is cancelled with - 18 on Right Side.

    Hence, the option A. is the correct option.
  2. 17 August, 15:50
    0
    A

    Step-by-step explanation:

    -6 and 6
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