Solve for the following systems using the algebraic method. 1. 3x + 4y = 12; 2x - 3y = 6 Mathematics IA - College Algebra 316 2. x+y = 3; x - y = 5 3. 3x + 2y - Z = 4; 2x - y + 3z = 4; x + y + 2z"