AlgebraEasy–MediumSum of the coordinates of a solution
Algebra practice question
The solution of the system y = x + 3 and y = −x + 7 is the point (a, b). What is the value of a + b?
Answer: 7
x + 3 = −x + 7 gives x = 2, so y = 5, and a + b = 7.
Common wrong answers
- If you answered 2
- 2 is a alone.
- If you answered 5
- 5 is b alone.
- If you answered 10
- 10 adds the two intercepts.
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