Answer:
x + 3y = 3
7x + y = 3
*Multiply both sides
-7x - 21y = -21
7x + y = 3
*eliminate one variable by adding the equations
-20y = -18
*Divide both sides
y = 9/10
*substitude the value of y
x + 3 x 9/10 = 3
*slove the equation
x = 3/10
*A possible solution is
(x , y) = (3/10 , 9/10)
*check the solution
3/10 + 3 x 3/10 = 7 x 3/10 + 9/10 =3
*simplify
3 = 3 =3
*The ordered pair is a solution
( x , y ) = ( 3/10 , 9/10 )