Answer
$(1,2)$
Work Step by Step
Terms containing $x$ are opposite in the additive sense.
Add the equations:
$ 7y=14\qquad$ ... and solve for $y$
$y=2$
Substitute into one of the initial equations:
$x+3y=7$
$x+3(2)=7$
$x=7-6$
$x=1$
Form an ordered pair $(x,y)$ as the solution to the system
$(1,2)$