SAT Math Multiple Choice Question 927: Answer and Explanation
If (x1, y1) and (x2, y2) are solutions to the system of equations shown on the graph, what is the value ofx1 + x2?
- A. –3
- B. 0
- C. 2
- D. 5
Correct Answer: D
Category: Passport to Advanced Math / Quadratics
Strategic Advice: The solutions to a system of equations presented graphically are the points where the graphs of the equations intersect.
Getting to the Answer: Read the graph carefully to find the points of intersection: (-2, 3) and (7, -1). The question asks for the sum of the x-coordinates of these points, and -2 + 7 = 5, so (D) is correct.