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y = - 6x - 7
titik balik x
=
=
=
= 3
titik balik y
= - 6x - 7
<kita mensubstitusi x titik baliknya, yaitu 3>
= - 6(3) - 7
= 9 - 18 - 7
= -16
jadi titik baliknya (3,-16)