Matematika

Pertanyaan

tolong dibantu yaa kakak*
tolong dibantu yaa kakak*

1 Jawaban

  • 2x + 3y = -5 || × 5
    10x + 15y = -25 .. (1)

    5x + 7y = -4 || × 2
    10x + 14y = -8 ... (2)


    10x + 15y = -25
    10x + 14y = -8
    ---------------------- (-)
    y = -17

    2x + 3y = -5
    2x + 3(-17) = -5
    2x = 51 - 5
    x = 46/2
    x = 23

    3x - 2y = 3(23) - 2(-17) = 69 + 34 = 103