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f(2)= a.2 + b = -1
f(-4)= a.-4 +b = 11
2a + b = -1
-4a + b = 11
6a=-12
a=-1/2
2a + b = -1
2.-1/2 + b = -1
-1 + b = -1
b=0
f(x)= ax+b
f(-1)= -1/2. -1 + 0
= 1/2
(3, -2)
4x - 3y - 8 = 0
m_{1} = -a/b
= -4/-3
= 4/3
Tegak lurus =>> m_{1} . m_{2} = -1
4/3 . m_{2} = -1
m_{2} = -1.3/4
m_{2} = -3/4
y - y_{1} = m ( x- x_{1} )
y - (-2) = -3/4 ( x - 3)
y + 2 = -3/4x + 9/4
y = (9-3x)/4 - (2)
y = (9 - 3x -8) / 4
4y = 1 - 3x
3x + 4y = 1