Are Home Equity loans tax deductible if used to buy another investment property

[Sri S.]

Hi, I am new to investing. I am in the process of financing my second investment home. I have an investment property A where I lived initially and built a good amount of equity. Since I have a primary home and investment home A, I am having trouble financing investment property B through a traditional mortgage. 

I want to buy an investment property B using the equity built in property A. Is that legal to use for another property? How does the tax-deductible work in this situation? Apart from that, any other options to consider for financing?