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Verified answer
A) f(x) ax + bf(4) = 4a + b = 5
f(-2) = -2a + b = 7
eliminasi b, maka :
6a = - 2
a = (-1/3)
cari b :
4a + b = 5
4(-1/3) + b = 5
b = 5 + 4/3 = 19/3
B) f(x) = (-1/3)x + 19/3