Nomor 15-18 caranya bagaimana ya? Tolong bantu jawab ya Terimakasih

15) f(2x + 3) = 8x - 2
Misal (2x + 3) = a
=> 2x = a - 3
=> x = (a - 3)/2
f(2x + 3) = 8x - 2
f(a) = 8(a - 3)/2 - 2
f(a) = 4(a - 3) - 2 = 4a - 12 - 2 = 4a - 14
f(x) = 4x - 14

16) m = -y/x = -3/-6 = 1/2 Karen tegak lurus
m1 . m2 = -1
m1 = -1/m2 = -1/(1/2) = -2

17.) 2x + 3y = 6
(a=x b=y) jadi a=2 b=3
m1 = -a/b = -2/3 (m1=m2)

(3,-4)
y-y1 = m(x-x1)
y+4 = -2/3 (x-3)
y+4 = -2/3x + 2
y = -2/3x + 2 - 4
y = -2/3x -2