Answer :
the answer is: 1° equation
[tex]-3x\text{ + 4y = 12}[/tex]2° equation
[tex]y\text{ = }0.75x\text{ + 3}[/tex]3° equation
[tex]X\text{ = }(-4,\text{ 0) + }\lambda(4,3)[/tex]and the 4° equation
[tex]-3x\text{ + 4y - 12}=\text{ 0}[/tex]the answer is: 1° equation
[tex]-3x\text{ + 4y = 12}[/tex]2° equation
[tex]y\text{ = }0.75x\text{ + 3}[/tex]3° equation
[tex]X\text{ = }(-4,\text{ 0) + }\lambda(4,3)[/tex]and the 4° equation
[tex]-3x\text{ + 4y - 12}=\text{ 0}[/tex]