Your SATMATH program, available from mcstutoring.com, has multiple submenus. The first is Algebra Equations. That menu has three submenus, the first of which is solving a System of 2 Equations.
This video shows the 3 different types of answers for a system of 2 equations. Most of the time, you’ll have a system of 2 equations with one unique solution, as in the first example, with X=1, Y=-2. Unless your instructor is diabolical or your test is tricky, a unique solution is what you’ll encounter about 80-90% of the time. If you were to graph these, the unique solution system of equations would intersect at one and only one point.
The other types of system of equations will be either no solution or infinite solutions. In the case in the video, both of these examples are simply labeled: No Unique Solution
If you want to improve your SAT Math along with your SAT Composite score quickly and easily, you can buy your copy of SATMATH for your TI-84 calculator from mcstutoring.com at this link: