Kakk di bantu dongg​

Jawab:

NOMOR 1

f(x) = ax + b

f(2) = 2a + b

f(2) = -2

Maka,

2a + b = -2

f(3) = 3a + b

f(3) = 13

Maka,

3a + b = 13

Kita cari nilai a dan b,

2a + b = -2

b = – 2 – 2a

Maka,

= 3a + ( -2 -2a ) = 13

= 3a – 2 – 2a = 13

= a – 2 = 13

= a = 15

= 2a + b = -2

= 2(15) + b = -2

= 30 + b = -2

= b = -32

Maka,

(A)

a = 15

b = -32

(B)

Persamaannya adalah,

f(x) = 15x – 32

(C)

f(4) = 15(4) – 32 = 60 – 32 = 28

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NOMOR 2

Diketahui f(x) = 3x – 2

A.) x = 2

= f(2) = 3(2) – 2 = 6 – 2 = 4

B.) f(a) = -5

= f(x) = 3x – 2

= f(a) = 3a – 2

= 3a – 2 = -5

= 3a = -3

= a = -1