Question

If the system of equations
2x + 3y = 7
2ax + (a + b)y = 28
has infinitely many solutions, then
A. a = 2b
B. b = 2a
C. a + 2b = 0
D. 2a + b = 0

Answer 1

Answer:

for infinitely many solution

2/2a = 3/ a+b

so 3a=a+b

2a=b

B. is correct b =2a