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22 October, 08:51

What is the solution of the system?

Use the substitution method.

{3x+2y=11

x-2=-4y

a The only solution is (12, - 52).

b The only solution is (4, - 12).

c There is no solution.

d There are an infinite number of solutions.

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Answers (1)
  1. 22 October, 10:37
    0
    Answer: (10, - 2)

    That is, x = 10, y = - 2

    Step-by-step explanation: Let 3x + 2y = 11 be equation I

    Let x - 2 = - 4y be equation II

    We shall use the substitution method like stated above.

    From equation II, add 2 to both sides

    x = 2 - 4y

    Next, substitute for the value of x into equation I

    3x + 2y = 11

    3 (2 - 4y) + 2y = 11

    6 - 12y + 2y = 11

    6 - 10y = 11

    Subtract 6 from both sides of the equation

    -10y = 5

    Divide both sides of the equation by 5

    -2 = y

    Next, substitute for the value of y (-2) into equation II

    x - 2 = - 4 (-2)

    x - 2 = 8

    Add 2 to both sides of the equation

    x = 10

    Therefore the solution is, (10, - 2)
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