October 2018 0 106 Report
Jika (a,b) merupakan penyelesaian dari sistem persamaan linier
{5x + 2y = 8
{3x - y = 18
nilai dari (2a + 3b) = . .
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dari Widwi1

Jawabanmu

RanshiVM
nurulinayah134
RanshiVM
3x - y = 18
      -y = 18 - 3x
       y = -18 + 3x

            5x + 2y = 8
5x + 2(-18 + 3x) = 8
      5x - 36 + 6x = 8
            5x + 6x = 8 + 36
                  11x = 44
                     x = 4

  3x - y = 18
3(4) - y = 18
  12 - y = 18
       -y = 18 - 12
       -y = 6
        y = -6

Himpunan Penyelesaian = {x, y} = {a, b} = {4, -6}

a = 4
b = -6

2a + 3b = 2(4) + 3(-6)
            = 8 - 18
            = -10

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