AlgebraEasy–MediumIdentifying a line by the signs of its slope and intercept
Algebra practice question
Which of the following functions has a graph in the xy-plane that is a line with a negative slope and a positive y-intercept?
- A. f(x) = −2x + 5Correct
- B. f(x) = 2x + 5
- C. f(x) = −2x − 5
- D. f(x) = 5x
Answer: A. f(x) = −2x + 5
Slope −2 (negative) and y-intercept 5 (positive).
Why the other answers are wrong
- B. f(x) = 2x + 5
- Positive slope.
- C. f(x) = −2x − 5
- Negative y-intercept.
- D. f(x) = 5x
- Positive slope and y-intercept 0.
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