What is the y-intercept of a line?

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Prepare for the Praxis Middle School Mathematics Exam with quizzes. Study with flashcards and multiple choice questions. Each question provides hints and detailed explanations. Ensure success on your test!

Multiple Choice

What is the y-intercept of a line?

Explanation:
The main idea is where a line meets the vertical axis. The y-intercept is the point where the line crosses the y-axis, which means the x-coordinate is zero at that point. In slope-intercept form, y = mx + b, the constant b is exactly the y-coordinate when x is zero, so that point is the y-intercept. For example, if the line passes through (0, 4), the y-intercept is 4. It’s not the distance between intercepts, not the slope, and not the point where the line crosses the x-axis (that would be the x-intercept, where y = 0).

The main idea is where a line meets the vertical axis. The y-intercept is the point where the line crosses the y-axis, which means the x-coordinate is zero at that point. In slope-intercept form, y = mx + b, the constant b is exactly the y-coordinate when x is zero, so that point is the y-intercept. For example, if the line passes through (0, 4), the y-intercept is 4. It’s not the distance between intercepts, not the slope, and not the point where the line crosses the x-axis (that would be the x-intercept, where y = 0).

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