Which of the following values would complete the ordered pair if the point is on the graph of ƒ(x) = -2x + 3?
(-1,
1. -4
2. 0
3. 1
4. 5

The x value given is -1.

On the coordinate-plane, a coordinate is labeled by (x, y). 

That's how we get x = -1.

We plug in -1 for x, or, just substituting -1 for x. 

f(x)=-2x+3
        ↓
f(-1)=(-2)(-1)+3
        ↓
f(-1)=2+3
        ↓
f(-1)=5

The value 5, for "y," would complete the ordered pair.