Question 168889
You're on the right track.
Watch the parentheses though, they got you in trouble in the next line.
{{{2((1-2y)/4) + 3y = .70}}}
{{{(1-2y)/2+3y=0.70}}}  
{{{(1-2y)+6y=1.40}}}Multiply both sides by 2 to get rid of denominators.
{{{1+4y=1.40}}}
{{{4y=0.40}}}
{{{y=0.1}}}
Then from above
{{{x =(1 - 2y)/4}}} 
{{{x=(1-.2)/4}}}
{{{x=0.8/4}}}
{{{x=0.2}}}