6x - 3y = 15 x + 3y = -8 Complete the description for three different substitution methods that can be used to solve this system .

x 2 − y = 2 ,  2 x − y = − 1

x + y = 3  ,  2 x − 8 y = 19

x + 2 y = 4  ,  x − y = − 3

Step-by-step explanation:

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the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies