Jawaban:

Nilai a = 3

Nilai b = -8

Penjelasan:

Rumus : f(x) = ax + b

persamaan :

f(4) = 4a + b = 4

f(2) = 2a + b = -2

Eliminasi:

4a + b = 4

2a + b = -2

__________ -

2a = 4-(-2)

2a = 4+2

2a = 6

a = 6÷2

a = 3

Nah karena nilai a sudah ketemu sekarang kita akan mencari nilai b :

nilai b = 2a + b = -2

= 2(3) + b = -2

6 + b = -2

b = -2-6

b = -8

( ini sbnrnya buat pengecekkan ulang )

Bukti bahwa nilai a = 3 dan nilai b = -8 :

f(4) = 3(4) + (-8)

= 12 (-8)

= 4

f(2) = 3(2) + (-8)

= 6 + (-8)

= -2

Selesai dehh, semoga membantu yaa