## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

$(-1,2)$
Terms containing $y$ are opposite in the additive sense. Add the equations: $11x=-11\qquad$ ... and solve for $x$ $x=-1$ Substitute into one of the initial equations: $9x+3y=-3$ $9(-1)+3y=-3$ $3y=-3+9$ $3y=6$ $y=2$ Form an ordered pair $(x,y)$ as the solution to the system $(-1,2)$