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In an (x,y) ordered pair, the first number shows the x-coordinate and the second number shows the y-coordinate.
To graph (-2,1), we first find -2 on the x-axis and make a mental note of this grid line. The x-coordinate -2 tells us to move two units left.
Next, we find 1 on the y-axis and follow this grid line until it intersects with the grid line from our x-coordinate. The y-coordinate 1 tells us to move one unit up.
The point (-2,1) lies on the point at which these two grid lines intersect.