If the system of equations k x + y + 2 z = 1 3 x - y - 2 z = 2 - 2 x - 2 y - 4 z = 3 has infinitely many solutions, then k is equal to ______ .

Question

If the system of equations k x + y + 2 z = 1 3 x - y - 2 z = 2 - 2 x - 2 y - 4 z = 3 has infinitely many solutions, then k is equal to ______ .,

MARKS App · Accepted Answer

If the system of equations P 1 : k x + y + 2 z = 1 P 2 : 3 x - y - 2 z = 2 P 3 : - 2 x - 2 y - 4 z = 3 Which are equivalent to equations of planes. We observe 5 P 2 - P 1 = 3 P 3 So, 15 - K = - 6 ⇒ K = 21

Search any question & find its solution

Looking for more such questions to practice?