Question

1. suatu fungsi f (x) = ax + b , jika f (5) = 16 dan f (-2) = -5 , maka nilai dari f (8) adalah...

2. gradien garis 3x - 2y = 7 adalah.....

Answer 1

F(5) 5a + b = 16
f(-2) -2a + b = -5
------------------------- -
7a = 21
a = 3

5a + b =16
15 + b = 16
b = 1
f(8) = 8a + b
f(8) = 8(3) + 1
f(8) = 24 + 1 = 25


3x - 2y = 7
-2y = -3x + 7
2y = 3x - 7
y = 3/2x - 7/2

m (gradien) = 3/2