Solve the following system of equations by method of cross-multiplication: `x+2y+1=0,\ \ \ \ 2x-3y-12=0`

Solve the following system of equations by method of cross-multiplication: 2x-y=6,\ \ \ \ x-y=2

Solve the following system of equations by method of cross-multiplication: x+a y=b ,\ \ \ \ a x-b y=c

Solve the following system of equations by method of cross-multiplication: 2x+y=35 ,\ \ \ \ 3x+4y=65

Solve the following system of equations by method of cross-multiplication: x+2y+1=0,quad 2x-3y-12=0

Solve the following system of equations by method of cross-multiplication: 2x-y=6,quad x-y=2

Solve the following system of equations by method of cross-multiplication: m x-n y=m^2+n^2,\ \ \ \ x+y=2m

Solve the following system of equations by method of cross-multiplication: a x+b y=a^2,\ \ \ \ b x+a y=b^2

Solve the following system of equations by method of cross-multiplication: a x+b y=a-b ,\ \ \ \ b x-a y=a+b

Solve the following system of equations by method of cross-multiplication: a x+b y=(a+b)/2,\ \ \ \ 3x+5y=4

Solve the following system of equations by using the method of cross-multiplication: 2x-y-3=0,\ \ \ \ 4x+y-3=0