Question 519614
Start with the formula for the area of a triangle:
{{{A = (1/2)b*h}}} Substitute: {{{b = 5x}}}, {{{h = 3x}}}, and {{{A = 67.5}}}
{{{67.5 = (1/2)(5x)(3x)}}} Simplify.
{{{67.5 = 7.5x^2}}} Divide by 7.5
{{{9 = x^2}}} Take the square root.
{{{x = 3}}} Discard the negative solution of {{{-3}}}
{{{b = 5x}}}
{{{b = 15}}}
{{{h = 3x}}}
{{{h = 9}}}