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8 September, 06:47

Solve using the substitution method

x-7y=19

5x=-2y-16

+1
Answers (2)
  1. 8 September, 06:48
    0
    x - 7y = 19 multiply both sides by 5

    5x - 35y = 95

    Substitute 5x = - 2y - 16:

    (-2y - 16) - 35y = 95

    (-2y - 35y) - 16 = 95 add 16 to both sides

    -37y = 111 divide both sides by (-37)

    y = - 3

    Put the volue of y to the first equation:

    x - 7 (-3) = 19

    x + 21 = 19 subtract 21 from both sides

    x = - 2

    Answer: x = - 2 and y = - 3 → (-2, - 3)
  2. 8 September, 06:54
    0
    (-2,-3)

    Step-by-step explanation:

    subtract - 7y from both sides to get x = 7y + 19

    plug in

    5 (7y + 19) = - 2y - 16

    distribute the 5

    35y + 95 = - 2y - 16

    subtract 95 from both sides

    35y = - 2y - 111

    add - 2y to both sides

    37y = - 111

    divide both sides by 37

    y = - 3

    plug in the y to find the x

    x = 7 (-3) + 19

    multiply 7 and - 3

    x = - 21 + 19

    subtract

    x = - 2

    make into a coordinate

    (-2, - 3)
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