please dijawab kk beserta caranya

1)
kurva y = x³ - x² + 6
x = 1 --> y = 6
m  = 3x² - 2x
x= 1 --> m = 1
y - y1 = m (x - x1)
y - 6= 1(x - 1)
y = x + 5

2.
y = -9x -2  -->m = - 9

y= x³+ 2ax² + b

m = y' = 3x² - 4a x
x = 1--> m = 3 - 4a
 -9 = 3 - 4a
4a = 12
a = 3