So if that's my y-axis there, and then let's say that this is my x-axis right over here, we've been given some points over here. We know when x is equal to zero, f of x is equal to zero. Let me draw those. So we have that point. When x is equal to two, y, or f of x, y equals f of x is going to be equal to negative two. So we have a negative two right over there. When x is equal to four, so three, four, f of x is equal to three, one, two, three.