Question

Show that the points (1,-1),(5,2) and (9,5) are collinear​

Answer 1

Answer:

Formula needed: area of ∆=½[x¹(y²-y³)+x²(y³-y¹)+x³(y¹-y²)]=0

Step-by-step explanation:

if the total area of the ∆ shows 0,the points are collinear.