diketahui fungsi f(x)= ax +b , jika f(-4)= 13 dan f(3)= -1, maka nilai dari a+b =

◾ Materi : Fungsi
◾ Sub materi : Fungsj
◾ Mapel : Matematika

Jawab :
f(x) = ax + b

Jika, f(-4) = 13
a(-4) + b = 13
-4a + b = 13
b = 13 + 4a

f(3) = -1
a(3) + b = -1
3a + (13 + 4a) = -1
3a+4a + 13 = -1
7a = -14
a = -2

b = 13 + 4a
b = 13 + 4(-2)
b = 13 - 8
b = 5

maka, a+b = -2+5 = 3

semoga membantu
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-vin

F(x)=ax+b
F(-4)=13
F(3) =-1

F(-4)=a(-4)+b=13
=-4a+b=13 #persamaan 1




F(3)=a(3)+b=13
=3a+b=-1 #persamaan 2



-4a+b=13
3a+b=-1
-----------
-a. =12
a =12/-1
a =-12

Mencari b=3a+b
=3(-12)+b
B=-36


Jadi a=-12
b=-36