Matematika

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tolong bantuannya :)
tolong bantuannya :)

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  • x-3y = 12 ... 1
    2x+5y = 2 ... 2
    ...1 dikali 2
    2x-6y = 24
    Dikuragi ... 2
    5y-(-6y)= 2-24
    11y = -22
    y = -2
    Subs ke ... 1
    x -3y = 12
    x +6 = 12
    x = 6

    (a,b) --> (x,y) --> (6,-2)
    2a-b = 2.6-(-2) = 14

    Nomor2
    P. Diagonal Ac = p. Diagonal BD
    7x-3 = 4x+6
    3x = 9 --> x=3
    P. D. AC = 7x-3 = 21-3 = 18

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