Do you have a picture?? Maybe? I’m not good at these
Given the equation;

To solve, let us multiply through by the least common multiple of the the denominator of the three fractions wich is 24;
Here you go enjoy
Have a good rest of your night
<span>The first step you need to do is to rewrite
x+y=3
as y=3-x
</span><span>Now we can replace the y in the equation with our newfound value for y, which is
y=3-x.
So lets write it now like this
Q=x^2+2(3-y)^2
=x^2+18-12x+2x^2
=3x^2+18-12x
</span>Hope this helps