Raymond B. answered 4d
Math, microeconomics or criminal justice
(12, 8) and (15,22) have a line through them
with a linear equation
with slope = rise over run = (22-8)/(15-12) = 14/3
the equation is
y-8 = (14/3)(x-12)
but (9,17)
makes it
17-8 = (14/3)(9-12)
9 = -14
a contradiction
which doesn't add up
so a non-linear equation is needed to fit all 3 points
plot the 3 points. An upward opening parabola would go through all 3, with a vertex x coordinate slightly less than 12
or maybe all you were asking were 2 separate questions
what is x and y for (9,17)? x=9 and y=17. (x,y)=(9,17).
and the slope for a straight line through the other 2 points, which is 14/3.