Answer:
(b) -4
Explanation:
You want the y-intercept of the line on the graph shown.
Axes
The darker horizontal and vertical lines on the graph are the x- and y-axes, respectively. They typically have numerical scales associated with them. Often, only some of the grid lines are numbered, so you need to interpolate to find the coordinates associated with the lines that don't have numbers.
This graph has numbers on every 5th line. Those numbers differ by 5, suggesting that each grid line represents one unit.
Y-intercept
The y-intercept of a graph is the point where the graph crosses the (vertical) y-axis. It can be given as the y-coordinate of that point, or as an ordered pair of coordinates. (The x-coordinate is always 0 at the y-intercept.)
The line shown on the graph crosses the y-axis on the 4th grid line below the x-axis. The y-value of that grid line is -4.
The y-intercept is -4.
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Additional comment
This is essentially a vocabulary question. You are expected to know the meaning of the term "y-intercept." (And you are expected to know how to read a graph.)
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