Do it the same way as you would with numbers...
Multiply equation 1 by and multiply equation 2 by to get
Now subtract equation 2 from equation 1 to eliminate the term.
For the simultaneous equations ax+by=p and bx-ay=q, show that x=(ap+bq)/(a^2+b^2) and y=(bp-aq)/(a^2+b^2)
I just can't figure out which method to use and how to do it. Because I've never done one without numbers before.
Many thanks in advance.