Question

Buatlah persamaan garis lurus dalam bentuk y=mx+c melalui titik A(2,-4) dan B(-1,8)

Answer 1

Pers.grs.melalui ttk.(2,-4)&(-1,8) :
y-y1 / y2-y1 = x-x1 / x2-x1
y-(-4) / 8-(-4) = x-2 / -1-2
y+4 / 8+4 = x-2 / -3
y+4 / 12 = x-2 / -3
-3(y+4) = 12(x-2)
-3y-12 = 12x-24
-3y = 12x-24+12
-3y = 12x-12
y = (12x-12) : (-3)
y = -4x+4