AlgebraEasyIntersection of two lines
Algebra practice question
In the xy-plane, the graphs of y = 2x and y = −x + 6 intersect at which point?
- A. (2, 4)Correct
- B. (4, 2)
- C. (6, 0)
- D. (3, 6)
Answer: A. (2, 4)
2x = −x + 6 gives x = 2, and then y = 4.
Why the other answers are wrong
- B. (4, 2)
- The coordinates are swapped.
- C. (6, 0)
- (6, 0) is only on the second line.
- D. (3, 6)
- (3, 6) is only on the first line.
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