Question 3402
Basically  the same way you would solve otherwise.<br>
3x-2.5y=7.125<br>
2.5x-3y=7.3125<br>

You should eleminate x or y and there is no particular advantage in picking one or the other in this case. So, let's pick x and use elimination:<br>
Multiply the first equation by {{{-2.5/3}}} and we get:<br>

{{{(-2.5/3)*3x-(-2.5/3)*2.5y=(-2.5/3)*7.125 or<br>
{{{-2.5x + (6.25/3)y = -5.9375}}}<br>

Now add this to the second equation and we get<br>
{{{-(2.75/3)y = 1.375}}}<br>
Divide either side by -2.75/3 and we get y = -1.5. Substitute this value of y in to the first equation and we get x = 1.125.
<hr>
It is important to verify these numbers using the original equations:<br>
3x-2.5y=7.125 and <br>
2.5x-3y=7.3125<br>
become
3(1.125)-2.5(-1.5) = 3.375 + 3.75 = 7.125 and <br>
2.5(1.125)-3(-1.5) = 2.8125 + 4.5 = 7.3125<br>