Homework Help: 7th grade math

Posted by Delilah on Friday, December 7, 2012 at 8:13pm.

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 - Ms. Sue, Friday, December 7, 2012 at 8:16pm
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 - Delilah, Friday, December 7, 2012 at 8:21pm
so is:
#2.
10 - 3t
7th grade math - Ms. Sue, Friday, December 7, 2012 at 8:26pm
Yay! You're right! :-)

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