Jika f (x) = px + q dengan f (-5) = 10 dan f (4) = 6 Rumus f ?? F (5) ?? Bayangan dari x = -2 ? F (x) = 9

f (x) = px + q
f (-5) = -5p+q= 10
f (4) = 4p+q = 6
------------------------- -
-9p= 4
p=-4/9

4p+q=6
4.(-4/9)+q=6
-16/9+q=6
q=6+16/9
q=54/9+16/9
q= 70/9

f (x) = px + q
f(x) = -4/9x +70/9

f(5) = -5/9(5) + 70/9 = -25/9+70/9 = 45/9 = 5

x=-2=> -4/9(2) +70/9 = -8/9+70/9= 62/9

f(x)=9=> -4/9(9) +70/9 = -36/9+70/9= 34/9 =