Question

Select all systems that are equivalent to this system:
6d + 4.5e = 16.5
5d + 0.5e = 4
1) 6d + 4.5e = 16.5
450 + 4.50 - 4
2) 6d + 4.5e = 16.5
60 + 4.5e = 16.5
3) 30d + 22.5e = 82.5
5d + 0.5e = 4
4) 30d + 22.5e = 82.5
300 + 3e = 24