Gradien garis yang melalui titik : A. (2, -4) dan (1, 2); B. (-3, 5) dan (2, -6); C. (0, 5) dan (5, 0); D. (-1, -2) dan (2, -3) adalah?

a) m = ( y2 - y1 ) / ( x2 - x1 )
m = ( 2 + 4 ) / ( 1 - 2 )
m = 6/- 1
m = - 6

b) m = ( y2 - y1 ) / ( x2 - x1 )
m = ( - 6 - 5 ) / ( 2 + 3 )
m = - 11/5

c) m = ( y2 - y1 ) / ( x2 - x1 )
m = ( 0 - 5 ) / ( 5 - 0 )
m = - 5/5
m = - 1

d) m = ( y2 - y1 ) / ( x2 - x1 )
m = ( - 3 + 2 ) / ( 2 + 1 )
m = - 1 / 3

Rumus mncari gradien yg melalui 2 titik : m = y2 - y1/x2 - x1

mA = 2 - (-4) / 1 - 2
= 6/-1
= -6

mB = -6 -5 / 2 - (-3)
= -11/5

mC = 0 - 5 / 5 - 0
= -5 / 5
= -1

mD = -3 -(-2) / 2 - (-1)
= -1 / 3