Question

Diketahui f(x)=ax + b.Jika f(3)=15 dan f(2)=11,maka nilai -3a+2b adalah...

Answer 1

F(3) --> a(3) + b = 15
3a + b = 15

f(2) --> a(2) + b = 11
2a + b = 11

3a + b = 15
2a + b = 11
Eliminasi b
a = 4

2(4) + b = 11
8 + b = 11
b = 3

-3a + 2b
= -3(4) + 2(3)
= -12 + 6
= -6