AlgebraEasyMissing coordinate of a system's solution
Algebra practice question
The point (2, k) is the solution of the system y = x + 2 and y = 2x. What is the value of k?
Answer: 4
At x = 2, both equations give y = 4.
Common wrong answers
- If you answered 0
- 0 comes from subtracting instead of substituting.
- If you answered 2
- 2 is the x-coordinate.
- If you answered 6
- 6 comes from 2 + 2 + 2, using x = 2 in both terms.
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