Algerbra 1B

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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 -

    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 -

    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

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