In the pair of equations bx-6y=18 and 2x - 3y=9, b is a constant. The system of two equations has an infinitely many solutions. What is the value of b?
A) 3
B) 4
C) 5
D) 6

Question

In the pair of equations bx-6y=18 and 2x - 3y=9, b is a constant. The system of two equations has an infinitely many solutions. What is the value of b? 
A) 3
B) 4
C) 5
D) 6

anonymous · Answer

infinitely many solutions, meaning it has to be the same line with the same slope and same constant.

what to do?

anonymous · Answer

ohhh i see

texaschic101 · Answer

2x - 3y = 9 -- multiply this by 2
4x - 6y = 18

so your missing number is 4

anonymous · Answer

ohh im so sorry i  get it now thanks

texaschic101 · Answer

good to hear :)

anonymous · Answer

I have a question. For any problems like this is general, how do you find what number to multiply?