Answer:
A. add that number to
Step-by-step explanation:
If you think about the meaning of a y-coordinate, you realize coordinate values increase as you go upward. That is, to move a point 1 unit higher than it was, you add 1 to the point's y-coordinate.
The value of a function is the y-coordinate on a graph. To move the graph up by some number of units. that number of units must be added to the function value.
