### Mathematics: Solving Systems of Equations

Solve system of two equations with x and y (use any technique): 1. 2x - y = 0 3x + 2y = 7 2. x + 2y = 4 2x - y = -7 3. 4x + y = 15 2x + 5y = 21 Assign x and y for unknown values, create system of two equations and find solution: 4. Investments. Michael Perez has a total of $2000 on deposit with two savings inst