Question 370133
1.{{{4x-y=9}}}
2.{{{x-3y=16}}}
Multiply eq. 2 by (-4) and add to eq. 1,
{{{4x-y-4x+12y=9-64}}}
{{{11y=-55}}}
{{{highlight(y=-5)}}}
Then from eq. 1,
{{{4x+5=9}}}
{{{4x=4}}}
{{{highlight(x=1)}}}