Question 188660
{{{A=(1/2)(b[1]+b[2])h}}} Start with the given equation.



{{{2A=(b[1]+b[2])h}}} Multiply both sides by 2.



{{{2A=h(b[1]+b[2])}}} Rearrange the terms.



{{{(2A)/h=b[1]+b[2]}}} Divide both sides by "h".



{{{(2A)/h-b[2]=b[1]}}} Subtract {{{b[2]}}} from both sides.



{{{(2A)/h-(h*b[2])/h=b[1]}}} Multiply {{{b[2]}}} by {{{h/h}}}



{{{(2A-h*b[2])/h=b[1]}}} Combine the fractions.



So the solution is {{{b[1]=(2A-h*b[2])/h}}}