For what ordered pair (a,b) are there infinite solutions (x,y) to the system
4x + ay = -8
2x - 3y = b
4x + ay = -8 ---> 4x + ay = -8
2x - 3y = b ---> 4x - 6y = 2b
Choose a = -6 and b = -4
Then, you have two equivalent equations: 4x - 6y = -8
4x - 6y = -8