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14 January, 10:59

Solve the system of the following equations:

x+3y=-1

2x+2y=6

(-4,1)

(2,-1)

(4,-1)

(5,-2)

+4
Answers (1)
  1. 14 January, 11:07
    0
    (5,-2)

    Step by step:

    step: Solvex+3y=-1for x:

    x+3y=-1

    x+3y+-3y=-1+-3y (Add - 3y to both sides)

    x=-3y-1

    Step: Substitute-3y-1forxin2x+2y=6:

    2x+2y=6

    2 (-3y-1) + 2y=6

    -4y-2=6 (Simplify both sides of the equation)

    -4y-2+2=6+2 (Add 2 to both sides)

    -4y=8

    -4y

    -4

    =

    8

    -4

    (Divide both sides by - 4)

    y=-2

    Step: Substitute-2foryinx=-3y-1:

    x=-3y-1

    x = (-3) (-2) - 1

    x=5 (Simplify both sides of the equation)

    Answer:

    x=5 and y=-2
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