Question 202875
{{{A=(1/2)h(a+b)}}} Start with the given equation.



{{{2A=h(a+b)}}} Multiply both sides by 2.



{{{2A=ha+hb}}} Distribute



{{{2A-hb=ha}}} Subtract hb from both sides.



{{{(2A-hb)/h=a}}} Divide both sides by "h" to isolate "a".



So the solution is {{{a=(2A-hb)/h}}}