Nilai Ama variabelnya ya, 1. 3x -2 = 7, 2. 3(x – 1) + x = – x + 7, 3. 3 n + 3 = 12, 4., 5. Umur ibu 3 kali umur danu., selisih umur mereka 30 tahun, berapa umur danu dan ibu?.

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Nilai Ama variabelnya ya


1. 3x -2 = 7
2. 3(x – 1) + x = – x + 7
3. 3 n + 3 = 12
4.

5. Umur ibu 3 kali umur danu.
selisih umur mereka 30 tahun
berapa umur danu dan ibu?.​

1).

3x – 2 = 7

3x = 7 + 2

3x = 9

x = 9/3

x = 3

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2).

3 (x – 1) + x = -x + 7

3x – 3 + x = -x + 7

4x – 3 = -x + 7

4x + x = 7 + 3

5x = 10

x = 10/5

x = 2

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3).

3n + 3 = 12

3n = 12 – 3

3n = 9

n = 9/3

n = 3

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4).

3/4z = 18

z = 18 ÷ (3/4)

z = 18 × 4/3

z = 72/3

z = 24

=======

5). Misal;

Ibu = x

x = 3y

Danu = y

x – y = 30

Umur Danu

3y – y = 30

2y = 30

y = 30/2

y = 15

Umur Ibu

x – y = 30

x – 15 = 30

x = 30 + 15

x = 45

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