Posted by Candy on .
Solve the system by substitution:
4.5x2y=12.15
3.25xy=0.75

algebra 
PsyDAG,
y = 3.25x  .75
4.5x  2y = 4.5x  2(3.25x.75) = 12.15
Solve for x, then y. To check, put both values into your first equation in your question above.