Write the given set using roster method. :
A = {(x,y) | x, y in Z and x + y = 3}

Write the given set using listing method. : A = {(x,y) | x, y in N and x + y = 3}

Solve the following subquestion: Write the union of the following sets A ={x|x in N and x is a divisor of 12} B= {y|y in N and y is a divisor of 19}

Use matrix method to solve the equations 5x - 7y = 2 and 7x - 5y = 3

Write the simplest form of the product: (x+6y)(x+3y)

Solve the following equations by the method of inversion: x+y+z = -1 , x-y+z = 2 and x+y-z = 3 .