Posted by **dillon** on Thursday, January 24, 2008 at 3:31pm.

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

- Algerbra 1B -
**PsyDAG**, Friday, January 25, 2008 at 1:04pm
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.

- Algerbra 1B -
**Bob**, Monday, January 27, 2014 at 5:43pm
Start paying attention in class and dont 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

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