The pair of equations ax + 2y = 9 and 3x+ by = 18 represent parallel lines, where a, b are integers, if:
A. a= b
B. 3a=2b
C. 2a=3b
D. ab=6
Answer:D
The pair of equations ax + 2y = 9 and 3x+ by = 18 represent parallel lines, where a, b are integers, if:
A. a= b B. 3a=2b C. 2a=3b D. ab=6