A variable needs to be eliminated to solve the system of equations below. Choose the correct first step. -9x – 4y = 20 x + 4y = 12 Add to eliminate x. Add to eliminate y. Subtract to eliminate y. Subtract to eliminate x. Submit Answer

Which of the following statements is true? a. the irrational number system is not closed under multiplication, because the product of two irrational numbers is always a rational number. b. the irrational number system is not closed under multiplication, because the product of two irrational numbers is not always an irrational number. c. the irrational number system is closed under multiplication, because the product of two irrational numbers is always an irrational number. d. the irrational number system is closed under multiplication, because the product of two irrational numbers is always a rational numbers. reset submit