AlgebraEasyMeeting a vertical line
Algebra practice question
In the xy-plane, the line y = 2x + 1 crosses the vertical line x = 3 at the point (3, k). What is the value of k?
Answer: 7
At x = 3, y = 2(3) + 1 = 7.
Common wrong answers
- If you answered 1
- 1 is the y-intercept, at x = 0.
- If you answered 3
- 3 is the x-coordinate, not y.
- If you answered 6
- 6 forgets the + 1.
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