Respuesta :

Find the slope first. Y2-Y1/X2-X1
-1 - -11
———
0 - -5

10
—
5

M=2

Now point slope form:
Y - Y1 = M(X - X1)

Y - 9 = 2(X - 5)
Y - 9 = 2X - 10
Y = 2X - 1

The function is f(x) = 2x - 1