Ontario Mathematics Proficiency Practice Test

Question: 1 / 400

Which of the following points represents a y-intercept in the equation y = mx + b?

m

b

In the equation y = mx + b, the variable "b" represents the y-intercept. The y-intercept is the point where the line crosses the y-axis. At this point, the value of x is zero. Therefore, when you substitute x = 0 into the equation, the equation simplifies to y = b. This indicates that the y-value at the y-intercept is equal to "b."

Thus, the correct identification of the y-intercept in the equation is represented by "b," confirming that it signifies the value of y when the line intersects the y-axis. This understanding is fundamental as it forms the basis for graphically interpreting linear equations and identifying key points on a graph.

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x

y

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