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3 August, 08:53

He equations9x-10y=6, 8x-10y=-23, 9x+10y=-16 and 8x+10y=13 are shown on the graph below.

Which is the approximate solution for the system of equations 8x-10y=-23 and 9x+10y=-16?

(-2.3, 0.5)

(-2.5, 1)

(-2.3, - 0.5)

(-2.5, - 1)

+5
Answers (2)
  1. 3 August, 09:32
    0
    (-2.3,0.5)

    Step-by-step explanation:

    Take the second equation we have y = (-16-9X) / 10

    Then, we will subtitute the value of y on the first equation

    8X - 10 (-16-9X/10) = -23

    Because 10 is denominator, it will delate with the numeber 10 that is multipling the - 16-9X. Then the equation is

    8X - (-16-9X) = -23

    then: 8x+16+9X=-23 So, 17x=-23-16 = > X=-2.3

    Then we put the value of X in the first equation so

    9 (-2.3) - 10y=-16 = > 10y=-16+20.7

    So, y=0.5
  2. 3 August, 10:35
    0
    A (-2.3,0.5)
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