Question

Titik R (-3, k) terletak pada garis yang melalui titik S (4, 7) dan T (2, -1). nilai K adalah

Answer 1

(y-y1)/(y2-y1) = (x-x1)/(x2-x1)
(y-7)/(-1-7) = (x-4)/(2-4)
(y-7)/(-8) = (x-4)/(-2)
(y-7)/4 = (x-4)
y-7 = 4x-16
persamaan : y=4x-9

y=4x-9
k=4(-3)-9
k=-12-9
k=-21

Answer 2

m = ( -1 - 7 ) : ( 2 - 4 )
m = 4

y = 4x - ( 16 - 7 )
y = 4x - 9

Titik potong sumbu y, x = -3
y = 4x - 9
y = 4(-3) - 9
y = -12 - 9
y = -21

Jadi, nilai k = -21