Utk persamaan 8x + 7= 9x + 12 nilai nilai berikut a.x + 2 b.3x - 4

8x + 7 = 9x + 12
8x - 9x = 12 - 7
-x = 5
x = 5 / (-1)
x = -5

Nilai x + 2
= -5 + 2
= -3

Nilai 3x - 4
= 3 (-5) - 4
= -15 - 4
= -19

Kelas 7 Matematika
Bab Persamaan Linear

8x + 7 = 9x + 12
8x - 9x = 12 - 7
-x = 5
x = -5

a] x + 2
= -5 + 2
= -3

b] 3x - 4
= 3 . (-5) - 4
= -15 - 4
= -19