Question

If the system of linear equations
$x+2y+3z=6$
$x+3y+5z=9$
$2x+5y+pz=q$
is consistent and has infinite number of solutions, then (p +q) is equal to

• A. 19
• B. 21
• C. 23
• D. 25

Answer 1

Answer: (C)

$p=8;q=15$
$\therefore (p+q)=23$