AlgebraEasyEquation of a line with slope 1 through the origin
Algebra practice question
Which of the following equations describes the line in the xy-plane on which every point has a y-coordinate equal to its x-coordinate?
- A. y = xCorrect
- B. y = −x
- C. y = 1
- D. x + y = 1
Answer: A. y = x
y = x is exactly the condition that y equals x.
Why the other answers are wrong
- B. y = −x
- y = −x gives opposite signs.
- C. y = 1
- y is fixed at 1.
- D. x + y = 1
- The coordinates add to 1.
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