Math

Help! I need to get these questions done before 8:30.
Write a system of equations to model each situation. Solve my any method.
4.You and some friends buy hamburgers and milkshakes for lunch. A hamburger costs $1.50 and a milkshake costs $2.00. The total bill for 12 items is $21.50. How many hamburgers and how many milkshakes did your group buy?
5. A collection of dimes and nickels is worth $0.55 There are 7 coins in all. How many dimes and nickels are there?

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  1. i dont know how to do them

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  2. Be patient. A math tutor will come on line sooner or later and may be able to help you. Ms. Sue and I can't.

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  3. h + m = 12 ----> m = 12=h

    1.5h + 2m = 21.50
    or 3h + 4m = 43
    I would solve these by substitution.

    coin problem:
    d+n = 7 **
    10d + 5n = 55
    divide by 5
    2d + n = 11 ***

    subtract ** from *** , and it comes apart very nicely

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