The point
is on
.
(a) The function is 
The point
is on
.
Subtract
from
-coordinate.

point on
.
Subtract
from
-coordinate.

point on
.
(b) The function is
.
is on
.
Add
to
-coordinate.

is on
.
Multiply
-coordinate by
.

is on
.
Add
to
-coordinate.

is on
.
(c) The function is
.
is on
.
Multiply
-coordinate by
.

is on
.
is on
.
(a)
.
(b)
.
(c)
.