Question 179338
1.{{{12x+18y=30}}}
2.{{{4x-13y=67}}}
Multiply eq. 2 by (3) and subtract it from eq. 1,
{{{(12x+18y)-3(4x-13y)=30-3(67)}}}
{{{12x+18y-12x+39y=-171}}}
{{{57y=-171}}}
{{{highlight( y=-3)}}}
Now use either eq. 1 or eq. 2 to solve for x,
1.{{{12x+18y=30}}}
{{{12x+18(-3)=30}}}
{{{12x-54=30}}}
{{{12x=84}}}
{{{highlight( x=7)}}}