不能
因为本来就有很多因素影响Y

Hello chuan1985,

Based on my knowledge, you don't have solid evidence to do so.
You may use P value or t value to evaluate independent variables influence on dependent variable.
We normally don't reply on constants to illustrate such influence.

Theoretically speaking, original equation will changed after inputting another variable.
This won't guarantee your conclusion.
You'd better use statistic terminology to illustrate your conclusion.

To make your conclusion reliable,
use adjusted R square not R square, please.
I hope this helps.