Answer:
A, B, & D
Explanation:
A: Linear functions are often written in point-slope form, y=mx+b.
B: The rate of change in linear functions is always a constant slope, the m value.
C: The initial value of a linear function could be zero. It depends on the line.
D: It makes sense that the graph of a linear function is a line.
E: A vertical line is not a function. You can do the vertical line test: if a vertical line were to hit more than one point at a single x-value, the line is not a function.
I hope this helps!