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m=f'(x)
m=2.3+2=8
gradiennya adalah 8
x + 6y = 72
6y = – x + 72
y = -1/6 x + 12
m1 = -1/6
Karena tegak lurus maka
m1.m2 = -1
m2 = 6y = x6 + 22
y’ = m2
6x5 = 6
x5 = 1
x = 1
y = x6 + 22
y = 16 + 22 = 23y – y1 = m(x – x1)
y – 23 = 6(x -1)
y – 23 = 6x – 6
y = 6x + 17