sebuah fingsi di nyatakan f(x)=ax+b,jika f(5)=25 dan f(4)= -11, nilai dari f(2)-f(5) adalah...

f(x) = ax + b
f(5) = 5a + b = 25
f(4) = 4a + b = -11

mengeliminasi b
5a + b = 25
4a + b = -11 (dikurangi)
a = 36

f(5) = 5a + b = 25
= 5.36 + b = 25
= 180 + b = 25
= b = 25 - 180
b = -155

f(x) = 36a - 155
f(2) = 36.2 - 155 = 72 - 155 = -83
f(5) = 25

f(2) - f(5) = -83 - 25 = -108