Matematika

Pertanyaan

tentukan nilai x...
a. 3x+8=7
b. 2x-2=3x-10
c. 5x-8=-10x-4
d.2x-12=1/4x+1/2
e. 2x-2y-7=3y-2x+10
f. 1/2x - 2y=3x-2/3y+6

1 Jawaban

  • Bagian A
    3x + 8 = 7
    3x = 7 - 8
    x = - ⅓

    Bagian B
    2x - 2 = 3x - 10
    3x - 2x = -2 + 10
    x = 8

    Bagian C
    5x - 8 = -10x - 4
    5x + 10x = -4 + 8
    15x = 4
    x = 4/15

    Bagian D
    2x - 12 = ¼ x + ½
    2x - 12 = (x + 2)/4
    4(2x - 12) = x + 2
    8x - 48 = x + 2
    8x - x = 2 + 48
    x = 50/7

    Bagian E
    2x - 2y - 7 = 3y - 2x + 10
    2x + 2x - 2y - 3y = 10 + 7
    4x - 5y = 17

    Bagian F
    ½ x - 2y = 3x - ⅔ y + 6
    ½ x - 3x - 2y + ⅔ y = 6
    ke dua ruas di kali 6
    3x - 18x - 12y + 4y = 36
    -15x - 8y = 36
    15x + 8y = -36

    semoga berguna +_+

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