diket f(×)= a×+b, f(-1) = -5 dan f(4) =5 nilai f(-6) adalah
Matematika
safitri211
Pertanyaan
diket f(×)= a×+b, f(-1) = -5 dan f(4) =5 nilai f(-6) adalah
1 Jawaban
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1. Jawaban ulfayunita28
f(x) = ax + b
f(-1) = a(-1) + b = -5
= -a + b = -5
f(4) = a(4) + b = 5
= 4a + b = 5
-a + b = -5
4a + b = 5
----------------- -
-5a = -10
a = 2
-a + b = -5
-2 + b = -5
b = -3
f(x) = 2x - 3
f( -6 ) = 2(-6) - 3
= -12 -3
= -15