Question 986696
{{{f(x)=5x+2}}}
Substitute,
{{{f(a)=5a+2}}}
{{{f(a+h)=5(a+h)+2=5a+5h+2}}}
So,
{{{f(a+h)-f(a)=5a+5h+2-5a-2=5h}}}
and
{{{(f(a+h)-f(a))/h=(5h)/h=highlight(5)}}}