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Math story problems. Pre Algebra.
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omghaha9798 Offline

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Math story problems. Pre Algebra.

This is gay. I can't do this. I know i'm retarded.

6. For parts (a) and (b), find the mystery number and explain your reasoning.
a. If you add 15 to 3 times the mystery number, you get 78. What is the mystery number?

b. If you subtract 27 from 5 times the mystery number, you get 83. What is the mystery number?

7. 7x + 12 = 18 + 5x
a. Find the value of x by solving the equation above using properties of equality or by drawing a picture.

b. Check your answer by substituting for x in the original equation.

7 ( ) + 12 = 18 + ( )

Thank you...
04-25-2012 12:50 PM
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Miller0700 Offline
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RE: Math story problems. Pre Algebra.

6a is 21.
6b is 110 (I think...)

7a is 3 and check its validity for 7b.

Previously known as Derchin.
04-25-2012 12:58 PM
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SaintVicious Offline

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RE: Math story problems. Pre Algebra.

3x + 15 = 78 78-15 63/3 =21 therefor x=21
5x - 27 = 83 change the minus 27 to plus negative 27 to 5x + -27 = 83 subtract negative 27 (which is adding) you get 5x=100 100/5 is 20 x=20
7x +12 = 18 + 5x subtract like terms you are left with 6 = 2x 6/2 x=3
7b plug it in 7(3) + 12 = 18 + 5(3) 33 = 33
04-25-2012 01:05 PM
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