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

Solve the following system of equations by using the method of substitution: 3x-5y=-1,\ \ \ x-y=-1

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

Solve the following system of equations by using the method of substitution: 2x+3y=9,\ \ \ 3x+4y=5

Solve the following system of equations by using the method of substitution: 3x-5y=-1,quad x-y=-1

Solve the following system of equations by using the method of substitution: (2x)/a+y/b=2,\ \ \ \ x/a-y/b=4

Solve the following system of equations by using the method of substitution: 2x+3y=9,quad 3x+4y=5

Solve the following system of equations by using the method of cross-multiplication: x+y=7,\ \ \ \ 5x+12 y=7

Solve the following system of equations by method of substitution: 3x+2y+25=0,\ \ \ \ 2x+y+10=0

Solve the following system of equations by using the method of cross-multiplication: 2x+3y=17 ,\ \ \ \ 3x-2y=6

Solve the following system of equations by using the method of substitution: (2x)/(a)+(y)/(b)=2,quad (x)/(a)-(y)/(b)=4