Question 337900
Let's use the distance formula:{{{d = rt}}} where d = distance(miles), r = rate
(speed)(mph), and t =time(hours).
{{{d = rt}}} Substitute {{{r = 1/(t+a)}}} and {{{t = bt+ab}}}
{{{d = (1/(t+a))(bt+ab)}}} In the second parentheses, factor out a b.
{{{d = (1/cross((t+a)))(b*cross((t+a)))}}} Cancel the common factor ({{{t+a}}}) to leave you with:
{{{highlight(d = b)}}}