To solve this problem, we must remember that the vertical line in the middle of the graph (going up and down) is the y-axis, so y values are those that go up for positives and down for negatives. Conversely, the x-axis is horizontal and in the center of the graph, with the negatives to the left and the positives to the right.
If the x value is -1, this means that we have moved to the left of the origin (0 on both the x and y axes) one unit. The question asks what the y value is at this point. To find this, we must find what point the graph (light blue line) hits when the x-value is -1. The point is 3 units up from the x-axis, which means that the y-value is 3.
Therefore, your answer is 3.
Hope this helps!