How do you write a system of equations as a matrix equation?

Write the equations in standard form. Arrange the variables in the same order in each equation. Use the coefficients to fill the coefficient matrix. Put the variables in a vector that is multiplied by the matrix. Put the constants in another vector equated to the product of the coefficients and variables.

Example:
  x - 2y = 3
  -4x + 5y = -7
can be written in matrix form as

A) 144.44 sq inches i believe

Because of mourning president bush's death