ka tolong di jawab nomor 15,16,dan 17 makasih

15. y-y¹=m(x-x¹)
y+3=1/3(x-5)
3(y+3)=x-5
3y+9=x-5
3y+x= -14 (B)

16. y-y¹=m(x-x¹)
y+3 = -2/3(x-5)
3y-9=-2x-10
3y-2x= -1 (D)

17. x¹= -2 , x2= -4 , y1= -4 y2 = 3

m = (y²-y¹)/(x²-x¹)
m= (3+4) / (-4+2)
m = 7/-2