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= m.1 +c = 5 = m.4 + c = -4
= m + c = 5 = 4m + c = -4
m + c = 5
4m + c = -4
------------- -
-3m = 9
m = -3
m + c = 5
-3c +c = 5
c = 5+3
c = 8
jadi nilai m = -3 c= 8
sehingga
h(x) = mx+c
-3(x) + 8
h(-4)
-3(-4) + 8 = 12 + 8 = 20
h(3)
-3(3) + 8 = -9 + 8 = 1