True or False?

1. The graph of a straight line in the x-y plane can have a y-intercept or an x-intercept, but not both.

2. If F(x) = 2x + 1, then:

F(z) + F(w) = F(z + w)

3. If G(x) = 3x, then:

G(z) + G(w) = G(z + w)

4. It is impossible for a line with slope 10 to pass through the point (5, 5).

5. If two lines in the x-y plane have two points in common, they have all points in common.