Solve each of the following systems of equations by the method of cross-multiplication:
ax+by=a+b2
3x+5y=4
x=12,y=12
axb−bya=a+b
ax−by=2ab
Solve each of the following systems of eqautions by the method of cross-multiplication:
ax+by=a-b
bx-ay=a+b
ax+by=a2
bx+ay=b2