persamaan garis yang melalui titik (-2,-4) dan (-3,-6) adalah.....

y - y1/y2 - y1 = x - x1/x2 - x1
y - (-4)/-6 - (-4) = x - (-2)/-3 -(-2)
y + 4/ -2 = x + 2 /-1

-1(y+4) = -2(x+2)
-y - 4 = -2x - 4
-y = -2x - 4 + 4
-y = -2x
y = 2x

Atau dg cara lain
m = -4 - (-6)/ -2 - (-3)
= 2/1 = 2
y = m(x - x1) + y1
y = 2(x - (-2)) + (-4)
y = 2x + 4 + (-4)
y = 2x