Question 101893
If {{{k(r)=7-4r}}}, find {{{(k(1+h)-k(1))/h}}}
{{{k(r)=7-4r}}}
{{{k(1)=7-4(1)=3}}}

{{{k(1+h)=7-4(1+h)=7-4-h=3-h}}}
{{{(k(1+h)-k(1))/h=((cross(3)-h)-cross(3))/h}}}
{{{(k(1+h)-k(1))/h=(-h)/h}}}
{{{(k(1+h)-k(1))/h=-1}}}