Algerbra 1B
posted by dillon on .
Solve Each Sysem Using Substitution. Check ach solution.
a = 2/5b 3
a = 2b  18
c = 3d  27
4d + 10c = 120
Thanks, hope someone helps

I will do one problem and let you do the other.
c = 3d  27
4d + 10c = 120
4d + 10(3d  27) = 120
4d + 30d  270 = 120
34d = 390
d = 11.47
c = 3d  27
c = 34.41  27 = 7.41
Check
4d + 10c = 120
4(11.47) + 10(7.41) = 120
45 + 74.1 = 120 (close, probably not exact due to rounding error. Even so, this shows the process.)
I hope this helps. Thanks for asking. 
Start paying attention in class and don't be afraid to ask the teacher a question it might sound stupid but your not the only one who dosent get it you know what i mean