Solve each of the following systems of eqautions by the method of cross-multiplication:
2x+3y=13
5x−4y=−2
x=12,y=13
2x+y=35
3x+4y=65
2x-y=6
x-y=2
5x+y−2x−y=−1
15x+y+7x−y=10
x+yxy=2,
x−yxy=6
x+2y+1=0
2x−3y−12=0