Use Cramer's Rule to solve the following system of equations (show your work on your scratch paper): D= x1 = D1 = , x2 = x1 - 2x2 + x3 = 3 2x12x2 + 4x3 = 2 4x1 + x2 = 7 D2 , x3 = D3 =

Solve the system of equations by Cramer's rule: 4x +3y = 2 11x + y+2z = 3 x+ 5y+2z =1

Ella has a cell phone plan. She tells you that after 8 months, she has paid a total of $760 and after 10 months, she has paid a total of $840. She does not remember the cost of the phone. Let's start by converting these to coordinates (m, C) where the inputs, m, are the number of months since Ella bought the phone, and the outputs, C, represent the total cost that Ella has paid after that many months. Coordinate for eight months: Coordinate for ten months:

Use Cramer's rule to solve the following system of linear equations: -3x + 4y - 5z = -4 2x+6yz = −6 5x - 7y +62 = 2