Two of the vertices of triangle ABC are A (1,2) and B(9,6). the slope of AC is 1 and the slope of BC is - 1/3. what are the coordinated of B?

is theree a formulaa?

You know the slope of AC and a point on AC

Find the equation of AC

You also know the slope of BC and a point on it. Find the equation of BC

Find the intersection of AC and BC, by solving the two equations.

Let me know what point you get