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7th grade math

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Simplify each expression.

1.
2z - 3y - 8z + y

2.
9 - 7t + 1 + 4t

3. For the summer, Tia buys 3 T-shirts and 2 pairs of shorts. Her brother buys 4 T-shirts and 1 pair of shorts. Define and use variables to represent the total cost.

I have no idea how to do this! Please help!

  • 7th grade math -

    1.
    2z - 3y - 8z + y

    Combine like terms:

    2z - 8z - 3y + y

    -6z - 2y

    Do the second problem the same way.

    3. This problem isn't clear. Do we assume that all T-shirts cost the same? Do all shorts cost the same? Please clarify. You may need to ask your teacher about this one.

  • 7th grade math -

    so is:
    #2.
    10 - 3t

  • 7th grade math -

    Yay! You're right! :-)

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