Question 190619
{{{P=2L+2W}}} Start with the formula for the perimeter for a rectangle



{{{P=2x+2(x-10)}}} Plug in the length "x" and the width x-10 (since the width is 10 yards shorter than the length)



{{{P=2x+2x-20}}} Distribute



{{{P=4x-20}}} Combine like terms.



So the equation for the perimeter is {{{P=4x-20}}}