Question 311014
Multiply eq.2 by (-3) and add to eq. 1,
{{{6x-9y-21x+9y=7.5+15}}}
{{{-15x=22.5}}}
{{{x=-1.5}}}
{{{highlight(x=-3/2)}}}
Then use either equation to solve for y.
{{{6x-9y=7.5}}}
{{{-9-9y=7.5}}}
{{{-9y=33/2}}}
{{{highlight(y=-11/6)}}}