Question 706229
If cost, {{{ C }}} is on the vertical axis and time in weeks {{{ t }}}
is on the horizontal axis,
The one-time fee of $195 is represented by a horizontal line
through the point (0,195), which is {{{ C = 195 }}}
Paying by the week  can be represented by the line
{{{ C = 15t }}}
Here's the plots:
{{{ graph( 400, 400, -2, 15, -10, 250, 195, 15x ) }}}