Answer:
No, he is not correct.
Explanation:
For a linear equation, the equation is y=mx+b. The "b" is the initial value or the y intercept. He's missing that part. For example, y=2x. If you plug in 2, you won't get 8. The correct equation is y=2x+4. If you plug in 2, it'll give you the correct y value, 8.