Question 927590


Two angles are Complementary when they
add up to 90 degrees (a right angle).

so, {{{x+y=90}}}....eq.1

if angle {{{x}}} is {{{4}}} times larger than angle {{{y}}}, then

{{{x=4y}}}....eq.2...substitute in eq.1

{{{4y+y=90}}}....eq.1..solve for {{{y}}}

{{{5y=90}}}

{{{y=90/5}}}

{{{highlight(y=18)}}}

and {{{x=4y}}}=>{{{x=4*18}}}=>{{{highlight(x=72)}}}