Question

Diketahui f(x)=ax+b jika f(2)=4 fdan f(5)=13 maka nilai f(10) adalah

Answer 1

Verified answer

Fungsi

f(x) = ax + b

f(2) = a2 + b
f(2) = 2a + b
4 = 2a + b

f(5) = a5 + b
f(5) = 5a + b
13 = 5a + b

2a + b = 4
5a + b = 13 
---------------- [-]
-3a = -9
a = 3

2a + b = 4
2(3) + b = 4
6 + b = 4
b = 4 - 6
b = -2

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

f(10) = 3(10) - 2
f(10) = 30 - 2
f(10) = 28

*Thanks

Answer 2

F(x) = ax + b

f(2) = a(2) + b
4 = 2a + b

f(5) = a(5) + b
13 = 5a + b

13 = 5a + b
4 = 2a + b
----------------- -
9 = 3a
a = 3

f(2) = 3(2) + b
4 = 6 + b
b = (-2)

f(10) = 3(10) -2
= 30 - 2
= 28