tolong di jawab dong,jawabnya jangan asal asalan

9.) 4x -2 = 10
4x = 12
x = 3

3y + 6 = 21
3y = 15
y = 5

Jadi, x+y = 3+5 = 8cm (a)

10.) Keliling = 4*s
Keliling = 4*(5x - 3)
Keliling = 20x - 12 cm (b)

9.
4x - 2 = 10
4x = 10 + 2
4x = 12
x = 3

3y + 6 = 21
3y = 21 - 6
3y = 15
y = 5

x + y = 5 + 3
= 8
Jawaban : 8 cm

10.
Keliling persegi = 4 s
= 4 ( 5x - 3 )
= 20x - 12
Jawaban : b . 20x - 12