X= y - 3 x + 3y = 13 what is the solution to the system of equations? a) (1, 4) b) (4, 1) c) (7, 4) d) (2.5, 5.5)

Hello,
{x=y-3
{x+3y=13;

{x=y-3
{y-3+3y=13;

{x=y-3
{4y=13+3;

{x=y-3
{4y=16;

{x=y-3
{y=16:4=4;

{x=4-3=1
{y=4;

{x=1
{y=4

the solution to the system of equations is (1,4)

Bye :-)