Question

Ini gimana ya pake cara substitusi? mohon penjelasannya

Answer 1

X = 1 -> y = 4
x = 2 -> y = 7
x = 3 -> y = 10
grafik fungsi linear misal:
f(x) = ax + b
f(1) = a(1) + b = 4
f(2) = a(2) + b = 7

a + b = 4
2a + b = 7
_________ -
a = 3
b = 1
rumus fungsi: f(x) = 3x + 1
Jawaban: D

Answer 2

x = 1, y = 4
x = 2, y = 7

f(1) = 4
    4 = a + b

f(2) = 7
    7 = 2a + b

Gunakan Metode Substitusi :

a + b = 4
      b = 4 - a

2a + b      = 7
2a + 4 - a = 7
a + 4        = 7
a              = 3

a + b = 4
3 + b = 4
      b = 1

Jadi, rumus fungsinya adalah (d). f(x) = 3x + 1