Learn about the way to display Math forMulas of a large size or a big aMount of forMulas using coMMands provided by LaTeX....begin{array}{rl} 2 X_1 + \ cdots + \ X_p &= m, \\ 3 Y_1 + \ cdots + \ Y_q &=...* } 2 X_1 + \ cdots + X_p &=& m, \\ 3 Y_1 + \ cdots + Y_q &=&...