Question

solve the system of linear equation using cramer's rule and matrix inversion method:
x + 2y = 1
2x+3y =5\2​

Answer 1

Answer:

// Solve equation [1] for the variable x

[1] x = -2y - 1

// Plug this in for variable x in equation [2]

[2] 2•(-2y-1) - 3y = 5

[2] - 7y = 7

// Solve equation [2] for the variable y

[2] 7y = - 7

[2] y = - 1

// By now we know this much :

x = -2y-1

y = -1

// Use the y value to solve for x

x = -2(-1)-1 = 1