Derive the expression for the location of all portfolios of two securities in expected return standard deviation

Question:

Derive the expression for the location of all portfolios of two securities in standard deviation space when the correlation between the two securities is -1. Expected Return
The expected return is the profit or loss an investor anticipates on an investment that has known or anticipated rates of return (RoR). It is calculated by multiplying potential outcomes by the chances of them occurring and then totaling these...