Question

Tentukan persamaan persamaan berikut yang ekuivalen !
a.3x + 9 = 18
b.5 + 2x = 11
c.7 - 2x = 3
d.x - 4 = -1
tolong ya

Answer 1

A.
3x + 9 = 18
<=> 3x + 9 - 9 = 18 - 9
<=> 3x = 9
<=> 3x : 3 = 9 : 3
<=> x = 3

b.
5 + 2x = 11
<=> 5 + 2x - 5 = 11 - 5
<=> 2x = 6
<=> 2x : 2 = 6 : 2
<=> x = 3

c.
7 - 2x = 3
<=> 7 - 2x = 3
<=> 7 - 2x - 7 = 3 - 7
<=> -2x = -4
<=> -2x : -2 = -4 : -2
<=> x = 2

d.
x - 4 = -1
<=> x - 4 + 4 = -1 + 4
<=> x = 3

Maaf jika jawabannya salah ...

Answer 2

A. 3x + 9 = 18
3x = 18 - 9
3x = 9
x = 9 ÷ 3
x = 3
B. 5 + 2x = 11
2x = 11 - 5
2x = 6
x = 6 ÷ 2
x = 3
C. 7 - 2x = 3
- 2x = 3 - 7
- 2x = -4
x = -4 ÷ -2
x = 2
D. x - 4 = -1
x = -1 + 4
x = 3

maaf apabila ada kesalahan..