Question 314969
1.{{{4x=720-3y }}}
2.{{{5y=12x}}}
Multiply eq. 1 by 3,
{{{12x=2160-9y}}}
Substitute this into eq. 2 directly,
{{{5y=2160-9y}}}
{{{14y=2160}}}
{{{y=2160/14}}}
{{{highlight(y=1080/7)}}}
Then from eq. 2,
{{{5y=12x}}}
{{{x=(5/12)y}}}
{{{x=(1080/7)(5/12)}}}
{{{highlight(x=450/7)}}}