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f(-2) => -2a+ b = 10 _
4a = -12
a = -12/4
a= -3
ambil salah satu
2a + b = -2
2 (-3) +b = -2
-4 + b = -2
b = -2 + 4
b = 2
rumus fungsi
f(x) = -3a + 2
f (4) = -3(4)+2
= -12 + 2
= -10