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Math Help - Solving equations.

  1. #1
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    Solving equations.

    In a practise GCSE mock paper too equations have come up and its told me to solve them. I think i have got the right answers to both of them but i wondered if you could tell me where i've gone wrong, if i have?
    so the first one is: 6t + 5 = 2t + 25
    I - 5 from both whole numbers.
    so i now have 6t = 2t + 20
    then i - 2t from both of the algebra numbers
    so i now have: 4t = 20
    then i divided for 4 on both sides
    and the answer i got was t = 5
    The second equation 2 (d + 4) = d + 15
    i expanded the equation out first: 2d + 8 = d + 15
    Then i - 8 from both of the whole numbers
    so i now have: 2d = d + 7
    then i - d from both of the algebra numbers
    so i now have d = 7.
    Have i gone wrong anywhere in both of them equations?
    Thanks in advance
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  2. #2
    A Plied Mathematician
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    Looks good to me! You can always (and you should!) plug your solution back into the original equation and check to see if it satisfies it.
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  3. #3
    Senior Member
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    Hi Mollyx;
    there are other ways to do these your way being one way to solve them.
    they are both correct as I see it.
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