Question

Tentukan penyelesaian di atas! nomor 16-20​

Answer 1

16

[tex]3x - 2 = x + 4[/tex]

[tex]3x - 2 + 2 = x + 4 + 2[/tex]

[tex]3x = x + 6[/tex]

[tex]3x - x = x + 6 - x[/tex]

[tex]2x = 6[/tex]

[tex] \frac{2x}{2} = \frac{6}{2} [/tex]

[tex]x = 3[/tex]

17

[tex]3(x - 1) + x = - x + 7[/tex]

[tex]3x - 3 + x = - x + 7[/tex]

[tex]4x - 3 = - x + 7[/tex]

[tex]4x - 3 + 3 = - x + 7 + 3[/tex]

[tex]4x = - x + 10[/tex]

[tex]4x + x = - x + 10 + x[/tex]

[tex]5x = 10[/tex]

[tex] \frac{5x}{5} = \frac{10}{5} [/tex]

[tex]x = 2[/tex]

18

[tex]5(3 - x) = 6 + 2x[/tex]

[tex]15 - 5x = 6 + 2x[/tex]

[tex] - 5x + 15 = 2x + 6[/tex]

[tex] - 5x + 15 - 15 = 2x + 6 - 15[/tex]

[tex] - 5x = 2x - 9[/tex]

[tex] - 5x - 2x = 2x - 9 - 2x[/tex]

[tex] - 7x = - 9[/tex]

[tex] \frac{ - 7x}{ - 7} = \frac{ - 9}{ - 7} [/tex]

[tex]x = 1 \frac{2}{7} [/tex]

19

[tex]4x - 2 = 6[/tex]

[tex]4x - 2 + 2 = 6 + 2[/tex]

[tex]4x = 8[/tex]

[tex] \frac{4x}{4} = \frac{8}{4} [/tex]

[tex]x = 2[/tex]

20

[tex]5x + 2 = 3x - 8[/tex]

[tex]5x + 2 - 2 = 3x - 8 - 2[/tex]

[tex]5x = 3x - 10[/tex]

[tex]5x - 3x = 3x - 10 - 3x[/tex]

[tex]2x = - 10[/tex]

[tex] \frac{2x}{2} = \frac{ - 10}{2} [/tex]

[tex]x = - 5[/tex]