Question

Tolong no 16,17,18 yaa sekalian cara .......makasih^^

Answer 1

17. f(x) = 5x-3
      f(4-3a)= 5(4-3a) = 5a-3
                = 20-15a = 5a-3
                = 20 +3 - 15a - 5a = 23 - 20a
18.
Rumus:


(Keterangan):
x1 y1  x2  y2
(2,13) (4,19)

= 
= 
=2y-26 = 6x-12
=2y = 6x-12+26
= 2y = 6x + 14
y = 3x + 7

Subtitusikan, 
y = 3 (31) + 7
y = 93 + 7
y = 101
=> Rp101.000 (C)