tolong bantu jawab...

3. y1-y2/x1-x2 = 0-4/0-2 = -4/-2 = 2
4. y1-y2/x1-x2 = 7-1/-4-(-2) = 6/2 = 3
5. y-y1=m(x-x1) = y-(-4) = -2(x+3)
y+4= -2x -6
y= -2x-6-4
y= -2x-10
6.y-y1/y2-y1 = x-x1/x2-x1
y-1/7-1 = x-8/6-8
6x-48= -2y+2 (hsilnya dpt dri kali silang)
6x+2y-48-2 = 0
6x+2y -50 =0
3x+y-25 =0