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bija089 [108]
3 years ago
7

!!!!!!!!!!!!help me

Mathematics
1 answer:
steposvetlana [31]3 years ago
5 0

Answer:

Step-by-step explanation:

i'll do a few of them

1)   one inch plus a half inch plus an eighth inch plus a sixteenth inch

     1 + 1/2 + 1/8 + 1/16         read the tick marks

     1 + 8/16 + 2/16 + 1/16    find a common denominators

     1 and 11/16                    add the sixteenth numerator

2)

3)

4)  6 inch  plus an eighth inch plus a sixteenth inch

     6 +  1/8 + 1/16         read the tick marks

     6 + 2/16 +  1/16       find a common denominators

     6 and 3/16              add the sixteenth numerator

5)   nine inch plus a quarter inch plus an eighth inch

     9  + 1/4 + 1/8          read the tick marks

     9 + 2/8 + 1/8          find a common denominators

     9 and 3/8              add the sixteenth numerator

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The system is:

i)    <span>2x – 3y – 2z = 4
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the last equation can be simplified, by dividing by -2, 

thus we have:

</span>i)    2x – 3y – 2z = 4
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The procedure to solve the system is as follows:

first use any pairs of 2 equations (for example i and ii, i and iii) and equalize them by using one of the variables:

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iii)   2x +2y +z = -5 

2x can be written as 3y+2z+4 from the first equation, and -2y-z-5 from the third equation.

Equalize:  

3y+2z+4=-2y-z-5, group common terms:
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i)    2x – 3y – 2z = 4
ii)    x + 3y + 2z = –7

multiply the second equation by 2:


i)    2x – 3y – 2z = 4
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Let's use elimination method, multiply the equation a by -2:

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-10y+9y-6z+6z=18-18
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Remark: it is always a good attitude to check the answer, because often calculations mistakes can be made:

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