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f (4) = 4a + b = 8
f (-1) = -1a + b = 18 -
5a = -10
a = -2
persamaan 2 :
4a + b = 8
4 (-2) + b = 8
-8 +b = 8
b = 8 + 8
b = 16
a + b = -2 + 16 = 14
f(4) = 4a+b = 8
f(-1) = -a+b = 18 _
5a = -10
a = -2
utk mencari b salah satu persamaan dimasukkan : f(4) = 4(-2) + b= 8 -8+b = 8
b = 8