Question 3361
You want to find the time <em>t</em> when the plane has 100 miles remaining using the equation remaining miles = {{{2650 - 475t}}}. In the equation, set remaining miles to 100, the equation becomes:<br>
{{{100 = 2650 - 475t}}}<br>
Now we have to manipulate the equation to make it give us a value for t<em>t</em>. In other words, isolate <em>t</em> in the equation.<br>
{{{ 100 - 100 = 2650 - 475t - 100}}} subtract 100 from both sides and the equation becomes {{{ 0 = 2550 - 475t}}}
{{{0 + 475t = 2550 - 475t + 475t}}} add 475t to both sides and the equation becomes {{{475t = 2550}}}
{{{(475t/475) = (2550/475)}}} divide 475 from both sides and the equation becomes {{{t = (2550/475) = 5.4}}} when rounded to the nearest 10<sup>th</sup>