Question 350699
X will be our first number, y will be our second.

{{{X = X}}}
{{{Y = 5x}}}
{{{Y-X = 72}}}
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{{{Y-X=72
{{{5X-X = 72}}}  <--- Plug in 5X for Y
{{{4X = 72}}}  <--- Combine like terms
{{{X = 72/4}}}  <--- Divide both sides by 4 to isolate X
{{{highlight(X = 18)}}}  <--- Answer for X
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Since {{{Y = 5x}}},
{{{Y=5(18)}}}  <--- Plug 18 in for x
{{{highlight(Y=90)}}}  <--- solve for Y